"Parts of speech" are the basic lexical categories of the words present in a language. It is very important to understand these, in order to understand the grammar and use of the language concerned.

Eg:

• Ram(Noun) ate(Verb) an(Determiner) apple(Noun) with(Preposition) a(Article) fork(Noun).
• राम(Noun) ने(Postposition) चम्मच(Noun) से(Postposition) मिठाई(Noun) खाई(Verb).

Each part of speech explains how the word is used. In fact, the same word can act as different parts of speechs depending on the context.

Eg: A noun in one sentence and an adjective in the next.

• The glass was broken(Verb).
• The broken(Adjective) glass pierced her flesh.

Part-of-speech tagging is the process of assigning a part-of-speech (lexical class marker) to each word in a corpus.

POS	Function	Example
Verb	Action or state	take, eat, है, सोना, गया
Noun	Naming word; person or thing	table, John, honesty, राम, कुर्सी, हिम्मत
Pronoun	Replaces Noun	he, she, you, मैं, वह
Determiner	Occurs before noun or noun phrase	the, many, all
Adjective	Describes noun	green, big, छोटा, सुन्दर, काला
Adverb	Describes Verb	naturally, slowly,धीरे, जल्दी
Preposition	Joins noun to other POS	in,of, about
Postposition	Joins noun to other POS	में, से, के लिए
Conjunction	Joins two words, phrases, sentences	but, so, और, या
Interjection	Express emotion or surprise followed by exclamation marks	Hello!, Hurray!, वाह!