How does a CPU work?A CPU works by executing instructions that have been read from memory - these instructions tell the CPU what operations need to be performed on particular data items stored in memory or registers. When an instruction is fetched from memory it is sent through the control unit where it is decoded, and any necessary addresses/data items are determined; this information is then passed along to the ALU where operations are actually carried out according to what was specified in the instruction. After the operations have been completed, any resulting values are stored back into memory if needed before fetching another instruction and repeating this process until all of the program’s instructions have been executed.What is a CPU?A Central Processing Unit (CPU) is the brains of a computer system - it's essentially what tells the computer what to do and how to do it. A CPU is composed of circuitry, which consists of three main components: a control unit, an arithmetic/logic unit (ALU), and a register set. The control unit fetches instructions from memory, decodes them, determines the address of data stored in memory (if necessary), and then passes the data and instruction information along to the ALU for processing. The ALU performs the computation or logic required by each instruction, stores intermediate results in registers if necessary, and then sends the result back to memory where it can be accessed by other programs or written to disk. The registers are used to hold short-term data while it is being processed by the CPU.What are cores?A core is one instance of an execution unit within a multicore processor. Each core has its own private cache, which allows it to carry out tasks independently without having to access main memory as often; however multiple cores can share resources such as an L2 cache. Multiple cores allow for greater parallelism when executing instructions, meaning that more instructions can be executed simultaneously and therefore more work can be done in less time than with one single-core processor. This makes multicore processors ideal for intensive computing tasks like video editing or 3D rendering..