Callback

Callback is a term used in various fields such as computer programming, telecommunications, and entertainment. It generally refers to a function or process that is executed in response to a specific event or condition.

In Computer Programming

In computer programming, a callback is a piece of executable code that is passed as an argument to other code, which is expected to call back (execute) the argument at a given time. This is a common technique in asynchronous programming and event-driven programming.

Types of Callbacks

• Synchronous Callbacks: These are executed immediately and in the same thread as the function that receives them.
• Asynchronous Callbacks: These are executed at a later time, often in a different thread, and are commonly used in non-blocking I/O operations.

Usage

Callbacks are widely used in JavaScript, Python, and other programming languages to handle events like user interactions, data fetching, and more.

In Telecommunications

In telecommunications, a callback is a method for reducing the cost of making a phone call. The process involves the user initiating a call to a service provider, which then calls the user back and connects them to the desired number.

Types of Callbacks

• International Callback: Used to reduce the cost of international calls.
• Corporate Callback: Used by businesses to manage and reduce telecommunication expenses.

In Entertainment

In the context of entertainment, particularly in theater and film, a callback is a follow-up audition where actors are asked to return for further evaluation. This is typically the second stage in the casting process.

Related Pages

• Asynchronous programming
• Event-driven programming
• Non-blocking I/O
• JavaScript
• Python (programming language)
• Telecommunications
• Theater
• Film

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