Tenses are the time of ur sentence or ur speech. there r 3 mainly types of tenses.
they are the past tense the present tense and the future tense. for  ex. the sentence
of prsent tense is i am giving u the book te past tense is i gave u the book. and the future tense is i will give the book.
hope this helps u!!!!!
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Tense is a form of a verb used to indicate the time, and sometimes the continuation or completeness, of an action in relation to the time of speaking.

we can also talk about time without using tenses (for example, going to is a special construction to talk about the future, it is not a tense)