Download Impasse

I downloaded a program called 'Counter'.
This is supposed to count and tell me some details of visitors to my blog site.
Not that there is a heavy traffic.
But the novelty attracts me.
When I tried to open and install it I came to the point where it shows on a window called 'Install' the following:

counter ........
counter.sql 2 kB
counter.zip 1 KB
sql_parse.php 5 KB

Please tell me now what do I do?
And what do those words mean:
sql, parse, php
Is there a site from where I can get definitions of the abbreviations
used in IT world?
thanks, ben