Back-end development means working on server-side software, which focuses on everything you can't see on a website. Back-end developers ensure the website performs correctly, focusing on databases, back-end logic, application programming interface (APIs), architecture, and servers.

The backend (or “server side”) is the portion of the website you don't see. It's responsible for storing and organizing data, and ensuring everything on the client-side actually works. The backend communicates with the frontend, sending and receiving information to be displayed as a web page.

A back-end web developer is responsible for server-side web application logic and integration of the work front-end developers do. Back-end developers are usually write the web services and APIs used by front-end developers and mobile application developers.

SQL is the most common backend language. It is used to interact with databases and to create and maintain relational databases.

• Three devices—servers, databases, and application programming interfaces—have their back-ends developed. A back-end developer should frequently be familiar with these systems' programming languages. Python, Java, . NET, Haskell, Clojure, Structured Query Language (SQL), RoR, and PHP are some of these languages.
• Backend developer skills are a combination of technical and soft skills required to perform all backend developer duties successfully. As a backend developer, you should have the technical skills to work with server-side scripting languages, APIs and database management tools.
• The back end refers to parts of a computer application or a program's code that allow it to operate and that cannot be accessed by a user. Most data and operating syntax are stored and accessed in the back end of a computer system. Typically the code is comprised of one or more programming languages.