Definition from Wiktionary, the free dictionary
- Note: the below discussion was moved from the Wiktionary:Tea room.
- The correct expansion would be Internet service provider, or internet service provider. It's not a proper noun, but as with other initialisms, I suppose many of the people who use it capitalize its expansion.
- The expansion shouldn't use the clunky-looking bold initials. This is not good typesetting practice, and advised against in Wikipedia (w:Wikipedia:Capitalization#Acronyms and initialisms).