One of the major differences between an SSD and a RAM is that an SSD is a non-volatile memory whereas, a RAM is a volatile memory. As a non-volatile memory, SSDs do not require any external power to retain their data. On the contrary, if power is lost, RAM loses all its memory (all information saved in it). In terms of user experience, the SSD stores your data and the Operating System files. On the contrary, the RAM (which is usually smaller) stores information the processor needs to process. When the processor needs information, instead of fetching it directly from the SSD (or any other storage), it fetches the information from the RAM. This process of the RAM proactively fetching the next information the processor will require makes the entire user experience better.