How NAT and PAN work in network?

NAT stands for Network Address Translation It maps private IP address or addresses (RFC1918) to Public Adress which are routable on the internet.

In the IPv4 system of addressing private IP address cannot be routed on the internet.

NAT came into existance to overcome the diminishing of IPv4 public IP addresses so that many private IP addresses can be mapped to a single or very few public IP addresses

Network concepts is good and other working prograss is good

Nat : When a employee in a company sends a request, his Private IP will go outside through the Router and will convert into Public IP in the internet (i.e.) already configured public IP's  on a router and when the response comes as public IP and will convert into configured Private IP's on the router.

PAT : when an individuals sends a request Private IP will convert into the single Public IP that is configured on that PORT and Vice versa

NAT and PAT i guess you mean. NAT translates internetwork address to routable addresses. address like 192.168.1.1 can not be routed via routers. you can use nat to translate them into one or more IP addresses. PAT uses port to separate applications data from each other.