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What is Memory capacity ?
Amount of data in digital form that can be stored inside the memory. Digital data is always one of the following 0 or 1.

How do you interpret your memory capacity or let’s explain what does 1 GB (Giga Byte) of memory means?

In decimal systems :
1GB = 10^9 bytes = 8 X 1 000 000 000 = 8 000 000 000 bits

This is a non-volatile memory. The information stored in this memory is not lost when the source of power is turned off.  

In some computer systems:

1GB = 1024 MB (Mega Byte)
1MB = 1024 KB (Kilo Byte)
1KB = 1024 B (Bytes)
1B = 8 Bits

Total capacity = 1024 X 1024 X 1024 X 8 bits = 8589934592 bits

Tip to memorize  :- This memory is a permanent storage and all your music,  pictures, games, applications etc are stored in this memory.




SD can go upto max 2 GB (Giga Bytes)
SDHC can go upto max 32 GB.

Other topics coming soon -

ROM - read only memory

UI - user interface

Keyboard - QWERTY

Physical - height, weight, width, thickness