PPP
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PPP or Point-to-Point Protocol is a method of connecting a computer to the Internet. PPP is more stable than the older SLIP protocol and provides error checking features. Working in the data link layer of the OSI model, PPP sends the computer's TCP/IP packets to a server that puts them onto the Internet.)
If you are not connecting to the internet via PPP (ie PPTP or PPPoe) then you can safely disable PPP.