Callers

Callers refers to entities (people, programs, or processes) that initiate a request or invoke a service. The term is frequently used in various contexts including:

• Telecommunications: In telephony, callers are individuals or devices that place telephone calls. This is the most common and easily understood usage of the term.

• Programming: In computer programming, a caller is a function, method, or procedure that invokes another function, method, or procedure (the callee). The caller passes control to the callee, and the callee typically returns control (and potentially data) back to the caller. This relationship is fundamental to structured programming and allows for modularity and code reuse.

• Customer Service: In customer service contexts, callers are individuals contacting a support center, help desk, or other service provider seeking assistance or information.

• General Usage: More broadly, a caller can be any entity that initiates an action, request, or communication with another entity.

The term emphasizes the initiating role of the entity in a specific interaction or transaction. The counterpart to the caller is the recipient of the call, request, or invocation (the callee or responder). The relationship between caller and callee is often hierarchical or sequential, with the caller initiating the interaction and the callee responding in some manner.