Yes, they're almost the same. If you say "in here" you are specifying that it's INSIDE a certain area. Inside a building, a car, a store, etc. If you say "Lets meet here", you could be talking about anywhere, inside or outside. If you say, "Lets meet in here", you woud be inside of some enclosed area.

here = at a place in here = inside some place! but in general talk i dont think there is much difference between this two words!

Hello Pabllot, There is a difference between both, they are usually not interchangeable. "here" means in, at, or to this place. "in here" means inside, within ,into a particular place ,inwards, indoors,, etc When you use "here" and "in here" in both cases you are pointing to certain places but the main difference is: **If you are in an enclosed place while the other is outside it ,you will point to it saying "in here" : "Come in here" indicates that the speaker is inside this place and asking someone outside it to step in . "Come here" indicates that the 2 persons are in the same spacial area but at 2 different points or spots in that area. So the one is asking the other to approach him to the point where he is standing or sitting. The same goes for saying " I am here" . You are pointing to your location in a certain place to someone who is within the same area whether enclosed or not. If you said " I am in here" it indicates that you are pointing to your location inside a place and the other person is outside this place. Using "in" to indicate indoors , inward location is used to confirm the opposing location of the other "outdoors, outside..). ** If you are pointing on the other hand to something ( an object) and you say: " It is here" , This indicates the object ( or anything) is visible somewhere on.over or under a surface. The book for example is on the table or the cat under the chair. "It is in here" Refers to the inward location of the thing. It has to be in an enclosed part or surface. It occupies the interior of any other object . The book is in the bag. Notice: When you point to the book inside the bag "It is in here" ,notice that you and the person you are speaking to are both outside the area where the book is located.When you used " come in here" the other was also outside the room or space where you were in. So the difference between both is a spatial discrimination taking the position of speakers into consideration.