ROM(Read-only memory): It is a memory chip which is non-volatile(can hold data without power) means does not losses its data when power is turned off. A ROM chip is primarily used to start-up process of a computer.

RAM(Random-access memory): It is a memory storage medium which is volatile(cannot hold data without power) means loses its information when power is turned off. A RAM chip is used perform normal operations.

Heyy Shivam, 

RAM stands for Random Access Memory and ROM stands for Read Only Memory. There is one major difference between RAM and ROM chip is that ROM can hold data without power and RAM cannot. ROM is meant for storage purpose and RAM is meant to enhance the performance of any device and is temporary storage. 

Hope you are cleared with my answer.