What does the word " Proof " mean of this etching

What does the word "proof" mean. Is It more valuable than a normal etching
It is Titled "Shakspear's Birth Place"
It says Drawn & Etched by W. Rider
Published 1827
Any Help would be Appreciated
Thanks
The Print is 7x8 in

 

I doubt that the word "proof" will add much to the value. This has the look of a book or magazine print. A proof is supposed to be a trial state, pulled to make sure the image looks as it is supposed to look before going into production. Why that would be printed on the paper, I don't know. Maybe this was done so the print could be submitted for approval by someone. Maybe it was produced in a small edition before being used elsewhere. Maybe none of the above.