| Definition |
Internal memory that stores data temporarily for CPU processing. |
External/permanent memory used to store data long-term. |
| Volatility |
Volatile – data is lost when power is off. |
Non-volatile – data remains even after power is off. |
| Speed |
Very fast access speed. |
Slower compared to primary memory. |
| Capacity |
Smaller storage capacity (e.g., 4GB–32GB RAM). |
Larger capacity (GBs to TBs). |
| Cost |
Expensive per unit storage. |
Cheaper per unit storage. |
| Examples |
RAM, ROM, Cache memory |
Hard disk, SSD, Pen drive, CD/DVD |