If both RAM and cache memory use transistors, then what purpose does cache memory serve? Can everything possibly be stored on a single memory chip?

Although RAM (Random Access Memory) is also a kind of volatile memory, its availability in transistor-based systems raises the question of why cache memory is necessary. Do you believe a computer can only use one kind of memory?

Because both cache memory and random access memory (RAM) are transistor-based, it is unclear why cache memory is required when RAM (Random Access Memory) is already available as a volatile memory. Do you think it's feasible to use a single kind of memory in a computer for all of its functions?

What good is cache memory if random access memory (RAM) uses transistors as well? Is there a universally useful kind of memory?