GZip/gzip is both the name for a compressed data format and any of several software applications implementing this format. It is commonly used to compress HTTP requests and responses, and combined with the tar format for archival.

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Brotli is much better at compression than Gzip. However, thoughtlessly cranking up the compression level will hurt response time. But a well-balanced mixture of static and on-the-fly compression might just do the trick.

If you have ever hosted a website or even administrated a server you'll be very well aware of bad people trying bad things with your stuff.