Coordinating conjunctions, also called coordinators, are conjunctions that connect two or more equal items.

Examples:

• He plays tennis and soccer
• He works quickly but accurately
• You'd better do your homework, or you'll get a terrible grade. 

Correlative conjunctions are used in pairs. They work in pairs to coordinate two items. Examples of correlative conjunctions include both...and..., either...or, not only... but also...

Examples:

• I didn't know that she can neither read nor write.
• You can either walk to school or take the bus. 
• Both Sara and James are invited to the party.
• Whether you watch TV or do your homework is your decision.
• Not only are they noisy, but they are also lazy.

Subordinating conjunctions, also called subordinators, are conjunctions that join a dependent (or subordinating) clause to an independent (or main) clause.

Examples:

• He reads the newspapers after he finishes work.
• Even if you get the best grade on the writing test, you'll need to pass an oral test.
• Although he is very old, he goes jogging every morning. 
• She didn't go to school because she was ill.
• They went to bed since it was late. 
• As soon as the teacher had arrived, they started work.

"So", subordinating conjunction or coordinator?

"So" is a small English word that can have different meanings. As mentioned in the table above, it is commonly used as a coordinator rather than as a subordinating conjunction. There are, however, instances when "so" may introduce the purpose, and in this case ", so" is used as a subordinating conjunction.

Examples:

• "I took my umbrella with me so I wouldn't get wet."
• " I stayed so I could see you."