Is liptons black tea their regular tea or is it a special tea?

Lipton's Black Tea is indeed their "regular tea". When people say "Lipton Tea", they usually are referring to Lipton's basic black tea. The commercial description of this tea from Lipton's website reads "The tea that started it all".

Lipton sells other black teas (both in the U.S. and abroad), and these teas are given other names, such as their black pearl tea. In some countries the basic Lipton black tea is called Lipton Yellow Label.