Multithreading is a key concept in computing that refers to two distinct but related implementations. Primarily, it denotes a feature within computer hardware, specifically called multithreading in computer architecture, which enables a single processing unit to handle multiple instruction threads concurrently. Separately, multithreading also describes a common technique in computer software, where a program is designed to divide its tasks into multiple threads of execution. Both approaches aim to enhance performance, responsiveness, and efficiency by allowing tasks to run in parallel, whether at the processor level or within an application's code.