Receptive Language 
Receptive language refers to a child's ability to understand language and words in nonverbal, verbal and written formats. Receptive language skills help children learn, play and engage in everyday activities as they respond to requests and follow instructions.
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Expressive Language
Expressive language is the "output" of language, or the ability to express your wants, needs, thoughts and ideas through verbal, or nonverbal, communication. It is the ability to put your thoughts into words and sentences in a grammatically correct way that makes sense.​

Pragmatic Language
Pragmatic language is the appropriate use of communication in social contexts. It is knowing what to say, how to say it, and when to say it. Pragmatic skills allow children to produce and understand words and sentences in ways appropriate to conversational context.