Triglycerides and cholesterol are both fatty substances known as lipids. But, triglycerides are fats; cholesterol is not. Cholesterol is a waxy, odorless substance made by the liver that is an essential part of cell walls and nerves.
GSM (Global System for Mobile communication) is a digital mobile telephony system that is widely used in Europe and other parts of the world. GSM uses a variation of time division multiple access (TDMA) and is the most widely used of the three digital wireless telephony technologies (TDMA, GSM, and CDMA).
Probably the most useful thing to know about the Global System for Mobile communications (GSM) is that it is an international standard. If you travel in Europe and many other parts of the world, GSM is the only type of cellular service available.