What does the term 'multi-core' refer to in processors?

The term 'multi-core' specifically refers to a processor that includes two or more cores, which are independent processing units, on a single chip. This design allows for improved performance and efficiency because multiple tasks can be processed simultaneously. Each core can handle its own thread, enabling the processor to perform parallel processing, which is beneficial for multitasking and running complex applications.

In contrast, having multiple processor chips in a system relates to a multi-processor configuration, not multi-core. Enhanced clock speeds pertain to how fast a processor can perform tasks but do not define the architecture of the chip itself. Similarly, processors with different architectures refer to variations in their design and operation rather than the number of cores within a single chip. Therefore, the best definition that aligns with the term 'multi-core' is the presence of multiple cores on a single processor chip.