Integrated Circuit (IC)

IC is an electronic circuit that is constructed entirely on a single small chip of silicon.
All the components that make up the circuit 
transistor, diodes, resistors and capacitors.

Different types of IC:

1) Small scale interagation (SSI):

Describes ICs having upto 10 equivalent gate circuits on a single chip and they include basic gates and Flip-flop.

2) Medium scale interagation (MSI):

Describes ICs that have 10 to 100 equivalent gates on a chip. They includes logic functions such as encoders, decoders, counters, registers, etc.

3) Large  scale interagation (LSI):

It is classfication of ICs that have from 100 to 10,000 equivalent gates on a chip including memories.

4) Very large  scale interagation (VLSI):

It describes ICs with complexity of more than 10,000 to 1,00,000 equivalent gate per chip.

5) Ultra large scale interagation (ULSI):

Describes very large memories, large microprocessor and lager single chip computers of more than 1,00,000 equivalent gates per chip.