**Frontend development** is the process of building the user interface (UI) of a website or application. It is the part of the website that users see and interact with, such as the layout, colors, fonts, images, and videos. Frontend developers use languages such as HTML, CSS, and JavaScript to create the UI.

**Backend development** is the process of building the server-side logic of a website or application. It is the part of the website that users do not see, but it is responsible for processing user requests, storing and retrieving data, and generating dynamic content. Backend developers use languages such as Java, Python, PHP, and Ruby to build the server-side logic.

Here is a table that summarizes the key differences between frontend and backend development:

| Feature | Frontend development | Backend development |
|---|---|---|
| **What users see and interact with** | Yes | No |
| **Languages used** | HTML, CSS, JavaScript | Java, Python, PHP, Ruby, etc. |
| **Responsibilities** | Designing and building the UI | Processing user requests, storing and retrieving data, generating dynamic content |

Frontend and backend developers work together to create a complete website or application. The frontend developer creates the UI that users see and interact with, and the backend developer builds the server-side logic that powers the UI.

Here is an example of how frontend and backend development work together:

1. A user visits a website and clicks on a button to search for a product.
2. The frontend developer's code sends the user's search request to the backend server.
3. The backend server processes the search request and retrieves the relevant product data from a database.
4. The backend server then generates a dynamic page that displays the product data to the user.
5. The backend server's code then sends the dynamic page back to the frontend developer's code.
6. The frontend developer's code then displays the dynamic page to the user.

Frontend and backend development are both essential for creating successful websites and applications. Frontend developers focus on creating a user-friendly and visually appealing UI, while backend developers focus on building the server-side logic that powers the UI.
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