USB drives and optical discs are also storage. Memory is made up of "random access memory" (RAM) chips, which are upgradable by the user in a desktop computer but not in a phone or tablet.
The term memory storage is occasionally used to accentuate "storage" because memory is commonly used as a synonym for storage. The term "memory storage" is actually more biology than technology.
Random Access Memory allows you ... only offers temporary storage for information. Information is lost as soon as it is powered off. The need for you to have a high RAM capacity keeps growing ...