A phrasal verb is a verb followed by a preposition or an adverb; the combination creates a meaning different from the original verb alone.

Example :
To get  =  to obtain  I need to get a new battery for my camera. 
To get together  =  to meet   Why don’t we all get together for lunch one day? 

Phrasal verbs are part of a large group of verbs called “multi-part” or “multi-word” verbs.
The preposition or adverb that follows the verb is sometimes called a particle.