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Tense comes from Latin word Tempus,Which meanse time.So tense means denotes the time of a verb.
    There are mainly three type of tense.
   1-Present tense
   2-Past tense
   3-Feture tense

1-Definition of Present tense:- A verb that indicates to present tense. 
Exam pal:-1-He reads a book.
                     2-The boy is reading a book.

  The present tense is devided in to Four parts:-1-Present simple,
             2-Present continues.
             3-Present perfect.
             4-Parfect continues.