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Every single computer that is connected to a modern network will have an IP address. IP stands for " Internet Protocol" and its the basis that the whole Internet is built on.
An IP address is commonly 4 groups of numbers seperated by dots. For example:

192.168.1.254

or

10.0.0.254

Normally, on an internal network like an office LAN, there will be one range of addresses, each machine being uniquely identified by the last digit, for example;

machine1 = 192.168.1.1
machine2 = 192.168.1.2
machine3 = 192.168.1.3 etc....

In order for your machine to " see " other machines on your network, your IP address has to be in the same "range" as the other machines, for example;

machine1 = 192.168.1.1
machine2 = 192.168.2.1

The 2 machines above will not be able to see each other because their range is different. Machine 1 belongs to 192.168.1.... and machine 2 belongs to 192.168.2..

A quick way to check your IP address :

Windows: run the command ipconfig from a DOS terminal

Linux: run the command ifconfig from a Terminal Command prompt.