Final answer:
Multi-threading, hyper-threading, kernel mode and user mode, pipelining and parallel processing are all different techniques that restrict what programs can do on a CPU.
Step-by-step explanation:
Multi-threading refers to a CPU's ability to execute multiple threads of a program simultaneously, improving overall performance. Hyper-threading is a technology that allows a single physical processor to behave as multiple logical processors, increasing efficiency. Kernel mode and user mode are two modes of operation for the CPU, where kernel mode has unrestricted access to system resources and user mode is more restricted.
Pipelining and parallel processing improve CPU performance by breaking down tasks into smaller steps that can be executed simultaneously. Pipelining involves dividing a task into stages and allowing each stage to work on different tasks simultaneously, while parallel processing utilizes multiple processors or cores to work on different tasks at the same time.