When a computer is connected to a network?

The internet is one example of a "Computer Network." As a result, then a computer which is connected to the internet is connected to a "Computer Network"

There are other types of computer networks which are not necessarily connected to the internet, such as some offices.

Typically you can be assured that your computer is connected to a computer network if:

(a) you are using the internet

(b) you are using a modem (many varieties include, but not limited to Telephone, Cellular, etc.)

(c) you are connected to a wall outlet, box, or other device with an "Ethernet" cable. (The ends of an Ethernet cable look the same as a phone cable, only wider (8 wires instead of 4)

Also . . . just because the "wires" are connected, doesn't mean that your computer is actually "participating" in the network . . . software, hardware, drivers . . . all these things have to be in place & working correctly for a full fledged network connection.yes irt i s1