We use conjunctions to join two words, phrases, clauses, or sentences together.  
1.1    AND


- To join words, phrases, clauses, or sentences.

For example:

a. Arun and Amir are my friends.

b. I am hungry and thirsty.

c. He ran and fell on the ground.

1.2    OR


- To show a choice between two things.

For example:

a. You can walk or take the bus.

b. Do you want a biscuit or a sweet.


A phrase is a group of words which does not make sense on its own. It does not contain a verb.

For example:

Up the stairs, in a minute, with my mother.


A clause is a group of words that contains a verb. It is part of a sentence.

For example:

I went to the playground (1 clause)

because I wanted to play football. (1 clause)

(went and wanted are verbs)