The term "computable" refers to a problem or function that can be solved or calculated using a systematic procedure, often through algorithms or computer programs. In mathematics and computer science, a function is considered computable if there exists a finite set of instructions that can produce the desired output for any valid input. In the context of Turing machines, which are theoretical models of computation, a function is computable if a Turing machine can be constructed to compute it. This concept is fundamental in understanding the limits of what can be achieved through computation and helps define the boundaries of algorithmic processes.