Preposition: An enormously versatile part of grammar, as in 'What made you pick this book I didn't want to be read to out of up for?'

3. What is Preposition?
 a function word that typically combines
with a noun phrase to form a phrase
which usually expresses a modification or
predication.
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4. Preposition can be defined as “A word
governing, and usually preceding, a noun or
pronoun and expressing a relation to another
word or element in the clause, as in ‘the man
on the platform’, ‘she arrived after dinner’,
‘what did you do it for ?”

5. Different Types of Preposition
Simple Preposition
Compound Preposition
Phrase Preposition
Particle Preposition
Double Preposition