When multiple instruction are overlapped during execution of program then function performed is called?

When multiple instructions are overlapped during the execution of a program, the function performed is called "instruction pipelining." This technique allows for the simultaneous processing of different stages of multiple instructions, thereby improving the overall throughput and efficiency of the CPU. By overlapping the execution phases, such as fetching, decoding, and executing instructions, pipelining minimizes idle CPU time and enhances performance.