GZIP compression is bundling (zipping) accumulating / stacking pages on a web server before the page is sent to the visitor.
This significantly increases / boosts the loading speed of the page by saving bandwidth.
The visitors' web browser then automatically unzips the pages. This compressing and unzipping process only takes a fraction of a second.
GZIP compression is recommended for all types of text files such as:
- HTML (.html) but also all types of dynamic HTML (such as extension .php, .aspx)
- Textfiles (extension .txt)
- Webservices, such as WSDL, REST and JSON
GZIP compression is not recommended for non-text files, such as graphical files and .zip files because it hardly saves space and can therefore increase the loading time.