So what are
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A preposition is a word which is used before a noun to show its
connection to another word in the sentence.
The dog rests
(The word "on"
is used before "the armchair". We understand that the dog is on
the armchair. He
is not under
it or beside
it, for example.)
The name "preposition" (pre + position) means "put before".
So prepositions usually come before
Here are some more examples:
She stands by
The cat leans against
the garbage can.
The sign is under
The rocket went through
They flew into
She is reading to
He is climbing up
A preposition can come before a pronoun as well.