For you to be better informed while choosing and installing themes, let's have a quick look at some factors to consider, and what actually makes a theme.
A WordPress theme is actually a collection of files in a folder. There are no special or unusual formats, just a few requirements for those files in the theme folder. The only requirements for a folder to be a valid WordPress theme are as follows:
style.cssfile and an
style.cssfile must have the basic theme information in its first five lines
There are a number of additional files that you'll find in most of the theme folders. They are as follows:
screenshot.pngfile is the little thumbnail that ...