What's true about Apex controllers?

Question:

What is the role of Apex controllers in Salesforce?

Answer:

In Salesforce, Apex controllers form the link between user interface and business logic. They're used both by Lightning Components and Visualforce pages but are primarily asynchronous and client-side in Lightning Components. They play a crucial role in handling server-side actions and responses in Salesforce applications.

Explanation:

In Salesforce, Apex controllers are essential components that bridge the gap between the user interface and the backend logic of an application. They are responsible for processing user input, performing database operations, and manipulating data in response to user interactions. Apex controllers are versatile and can be used in both Lightning Components and Visualforce pages.

When it comes to Lightning Components, they primarily utilize client-side Apex controllers to handle asynchronous calls to server-side Apex controllers. These controllers manage the flow of data between the client and the Salesforce servers, ensuring smooth communication and efficient data processing.

On the other hand, Visualforce pages rely on server-side Apex controllers to handle logic and data manipulation. These controllers execute on the server side and are crucial for processing user input, interacting with the database, and rendering dynamic content on Visualforce pages.

In conclusion, Apex controllers are indispensable in Salesforce development, serving as a critical link between the frontend user interface and the backend business logic. They enable developers to create interactive, data-driven applications that deliver a seamless user experience.