This question is a fundamental part of the Information Technology (IT) or Computer Awareness subject, specifically under the Computer Memory Hierarchy section.
To understand the difference, you have to look at how the computer uses these two types of storage:
1. Primary Memory (e.g., RAM)
Speed: It is connected directly to the CPU, making it extremely fast.
Volatility: It is volatile, meaning it loses all data when the power is turned off.
Purpose: It holds the data and instructions that the computer is currently using (running apps, open tabs).
2. Secondary Storage (e.g., HDD, SSD, Pen Drive)
Speed: It is much slower than RAM because data must be transferred to the primary memory before the CPU can process it.
Volatility: It is non-volatile (permanent). Data remains safe even if the computer is switched off.
Purpose: It is used for long-term storage of files, photos, and the operating system.
