1. A computer does what you tell it to do NOT what you want it to do.
The computer is only aware of individual electronic entities (bit) which contain data ( 1/0, on/off, etc.)
Everything else is for the benefit of the human.
A computer does what you tell it to do
NOT
what you want it to do.

2. **** **** **** **** **** **** **** ****
WORD
BYTE
NIBBLE
BIT
**** ****
**** **** ~ **** ****
Field1 Field2 ~ Fieldx Fieldy
File (multiple records)
Record (multiple fields)
Field (multiple characters)
Byte (1 Alpha, numeric, or alphanumerc character)
Record Record Record

3. Application
Utilities
Hardware
External Devices
Internal