What is private and public IP address?

Private IP. This IP inside network. Not connected with Internet.

Public IP. This IP address is you address on the internet.

private IP:is an internal addresss allocated to a device or node to communicate with other internal devices

public IP : an external address issued by the Internet service provider to access the world wide web

Private IP is the IP range is reserved to ISP 

eg : - 10.0.0.0 to 10.255.255.255

Public IP is the IP that can be given to the computer with unique IP

It is of two types 

1. Static ( Ip given to individual system )

2. Dynamic ( It is also know as DHCP , automatically assigned when a computer connect with the ISP, next time it connects it will get another IP)