How to block website in your computer

coming to third session how to block website in your computer If you want to keep your youngsters from accessing certain sites, you want to block certain cites due to their content, you can block sites by redirecting them to the computer’s IP address that is used for a loop back network connection.(127.0.0.1)loop back)only block your computer we are using ADSL Routers block website in routers ( TP-LINK ,D-Link ,Pro Link Routers block URL filter and IP filter,MAC filter )ZTC router only (ipfilter and mac filter)