Answer:
Primary storage also called as main memory. RAM is an example of primary memory.
Secondary storage are popular as we use them for permanent storage.
Step-by-step explanation:
Primary storage are temporary such RAM which are required for your program to execute. Without these storage, we can't use the computer for any operations. These memory keeps intermediate data and garbage out when the data no longer required.
On the other hand, when we need to store the data for future reference such as files, photos and videos we use secondary storage devices such as usb drive, hard disk etc.