I Have A Wifi Network, Is There A Way Or A Software That I Can Install To Track The Traffic On The Computers?

a few people connect with their laptops, i was wondering if there can be something installed to track what websites they visit witout having to install anything on their laptops/computers etc.
tahnks
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Are There Any Monitoring Software To Check Which Computer(s) Causing Traffic In A Busy Network?

Either commercial software or shareware. Assume the network is with or without internet access. I like to compare both situation.