Definition of here adverb from the Oxford Advanced Learner's Dictionary

      

    here

     adverb
    adverb
    BrE BrE//hɪə(r)//
     
    ; NAmE NAmE//hɪr//
     
     
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  1. 1  used after a verb or preposition to mean ‘in, at or to this position or place’ I live here. Put the box here. Let's get out of here. Come over here.
  2. 2  now; at this point The countdown to Christmas starts here. Here the speaker paused to have a drink.
  3. 3  used when you are giving or showing something to somebody Here's the money I promised you. Here's a dish that is simple and quick to make. Here is your opportunity. Here comes the bus. I can't find my keys. Oh, here they are. Here we are (= we've arrived).
  4. 4  here to do something used to show your role in a situation I'm here to help you.
  5. 5(used after a noun, for emphasis) My friend here saw it happen.
  6. Word Origin Old English hēr, of Germanic origin; related to Dutch and German hier, also to he.Idioms (Welsh English) here; to here Come by here now!  in various places Papers were scattered here and there on the floor. (informal) used when you are telling people that you are just going to do something exciting, dangerous, etc. ‘Here goes,’ said Grace and took a deep breath.
    here’s to somebody/something
     
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    used to wish somebody health or success, as you lift a glass and drink a toast Here's to your future happiness!
    here, there and everywhere
     
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    in many different places; all around
    (informal) said when something is starting to happen ‘Here we go,’ thought Fred, ‘she's sure to say something.’ (informal) said when something is starting to happen again, especially something bad  (informal) used when you are giving something to somebody Here you are. This is what you were asking for. (informal) used when you are giving something to somebody Here you go. Four copies, is that right? not important synonym irrelevant What might have happened is neither here nor there. (informal) going or leaving As soon as I get my money I'm out of here!
See the Oxford Advanced American Dictionary entry: here