Backend: What is it and what is it for?

Digital Marketing 26 December 2023

In technology and software development, thebackendis a critical piece that often operates in the background, but plays an essential role in the operation of applications and websites.

Unlike the frontend, which handles the user interface and direct user interaction, the backend deals with the behind-the-scenes operations that allow an application to run efficiently.

In this article, we will explain in detail what backend is and why it is so important in managing data, and processing requests for the functionality of an application.

What is backend?

The “backend,” also known as the “back part” in Spanish, refers to the non-visible part of a software system, application or website.

It is the application layer that is responsible for processing logic, data management, security and communication with the server and databases.

In other words, the backend takes care of everything that happens “behind the scenes” to make an application work efficiently and deliver functionality to users.

What are the functions of the backend?

  1. Data processing: The backend handles the business logic and calculations necessary to provide information or perform actions in response to user requests.
  1. Data storage: Manages and stores data in databases, file systems or other media, allowing the application to retain information in a structured manner.
  1. Security: Implements security measures, such as authentication and authorization, to protect data and ensure that only authorized users have access to certain parts of the application.
  1. Communication with the frontend: The backend communicates with the user interface (frontend) and provides the data and results necessary for users to interact with the application.
  1. Integration with external services: You can interact with external services, such as third-party APIs, to obtain or send additional data and functionality.
  1. User management: Manages user records, passwords and other data related to user authentication.
  1. Performance Optimization: This is responsible for application performance optimization, such as load handling, caching and scalability.
  1. Updates and maintenance: Allows the implementation of updates and bug fixes, in addition to maintaining the continuous operation of the application.

Importance of the Backend

The importance of the backend in the development of applications and websites is fundamental, as it plays an essential role in the functionality and efficiency of any software system. Here we highlight some of the key reasons that underline the importance of the backend:

Data management

The backend is responsible for managing and storing data securely. This includes databases, file systems and other mechanisms for storing and retrieving critical information. Proper data management is essential to ensure that the application delivers accurate and reliable results.

2. Business logic

The backend houses the business logic of an application. It is where the rules, calculations and workflows that allow the application to operate according to specific business requirements are defined. This ensures that the application meets its objectives and provides real value to users.

3. Safety

Safety is of paramount importance in any application. The backend implements security measures, such as authentication and authorization, to protect data and ensure that only authorized users have access to certain parts of the application. It is also responsible for protecting the application against attacks and cyber threats.

4. Backend communication with the frontend

The frontend and backend work together to provide a complete user experience. The backend responds to requests from the frontend, providing the data and results necessary for the user interface to be effective. This ensures that users can interact with the application in a smooth and responsive manner.

5. Integration with external services

In an interconnected world, applications often rely on external services, such as third-party APIs. The backend facilitates integration with these services, allowing the application to access additional functionality and data from external sources.

6. Scalability and performance

The backend must be designed to handle the load and scale as needed. This is essential to ensure that the application can grow as user demand increases, without sacrificing performance.

7. Maintenance and upgrades:

The backend allows you to deploy updates, security patches and bug fixes efficiently. It also ensures that the application continues to run smoothly, which is essential to provide a reliable user experience.

Backend components


The backend of an application or website is composed of several components that work together to provide the necessary functionality and support the operation of the system. Typical backend components are described below:

1. Backend servers

Servers are physical or virtual components that run the backend software and respond to frontend and client requests. They may include web servers, application servers and database servers, among others.


The database is where critical application information is stored, such as user data, products, transactions, logs and more. Database management systems (DBMS) such as MySQL, PostgreSQL, MongoDB, or SQL Server are used to manage and query data.

3. Application server

The application server is responsible for executing the business logic of the application. It processes frontend requests, performs calculations, accesses the database and generates dynamic responses for the client.

Examples of application servers include Apache Tomcat, JBoss and Node.js.

4. API (Application Programming Interface)

APIs are sets of rules and protocols that enable communication between the frontend and backend, as well as between different backend components. APIs facilitate service integration and data transfer.

5. Static file servers

Static files, such as images, style sheets and scripts, are stored and served from static file servers. These servers are designed to deliver raw content, which reduces the load on the application server.

6. Business logic

Business logic represents the rules and operations that define how the application works. This includes data manipulation, request processing and decision making based on user input.

7. Authentication and authorization system

These systems manage user identification and validation, as well as authorization to access certain resources and perform specific actions in the application.

8. Caché

The cache is used to temporarily store data or responses to speed up access to information. This reduces the load on the database and improves application performance.

9. Background processing programs

These programs perform tasks that do not need to be executed immediately in response to a user request. They may include import processes, report generation, sending scheduled e-mails, among others.

10. External services and integrations

External services, such as third-party APIs, integrate with the backend to access additional functionality or exchange data with external systems, such as payment services, social networks or geolocation services.

11. Error and log management system

The backend must be able to detect, log and manage errors, which facilitates troubleshooting and maintenance of the application.

What is the difference between backend and frontend?

backend and frontend are two fundamental components in application development, and they differ in terms of their responsibilities, focus and location in an application or website. Here are the main differences between the backend and the frontend:

1. Responsibilities

2. Location

Technologies and languages

4. Security and data access

5. Performance

6. User Interface

In short, the backend is the backbone of an application or website, as it handles business logic, data management, security and communication with external databases and services.

Although it is not visible to users, its efficient operation is essential to provide a reliable and secure experience. The robustness of the backend is critical to support the functionality of the application and ensure its success.

Need help? At Kiwop, we are experts in both frontend and backend development. We pride ourselves on delivering applications and websites that not only look good, but also work flawlessly. Do not hesitate to contact us!


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