What are the examples of most popular services we tend to make use of quite systematically?

Services is a term that has various meanings. For example people who have more experience in the field of economics are rather likely to correlate it with one of the most influential areas that contribute the most to the progress of each economy. On the other hand, significant percentage of people, who are not keen on the in the top mentioned field, tend to think about the above presented term rather like something that we take advantage of systematically, like going to a hairdresser, having our car repaired by a mechanic etc.