When do we use apostrophes - Computers & Internet

In the English language, apostrophes are used in two general cases.
The first is when a contraction, the combination of two words, is used. Word phrases like can not, should not, and I will become can't, shouldn't, and I'll. The other usage is to show possession for nouns. The noun does not have to be proper (ie: a person's name). For example, we can say "Under the hood of the car" or we can say "Under the car's hood". We can say "This wallet belongs to Michael", or we can say "This is Michael's wallet."