Parts of speech are the basic types of words used in the English language. There are eight parts of speech: nouns, pronouns, adjectives, verbs, adverbs, prepositions, conjunctions, and interjections. Each part of speech has a specific grammatical function and meaning. For example, nouns name people, places or things, verbs express actions or states of being, and prepositions show relationships between other words in a sentence. Understanding the different parts of speech is fundamental to using the English language correctly and effectively.