Question : How do I allow access to certain websites only?

I have two computers whose users require access to specific websites for their jobs, but I would like to block everything else.  How can I set the sites for them to be able to access while blocking all of the time wasting sites they frequent?  (There are too many to block individually...)  I am not sure if there is something within Windows that I can do to accomplish this (like using the hosts list in C:\windows\system32\drivers\etc to BLOCK specific sites, but I need the exact oppisite).  Or if there is something in the individual browsers that I can use.  Thank you!

Answer : How do I allow access to certain websites only?

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