File compression is still the best way to send a huge bunch of photos to your dearest friend. It is one of the most important operations on almost every operating system, and is, therefore, inundated with a barrage of apps concerning it. On Windows too, file compression comes built-in, and so does on Linux. That said, the default compression method isn't always the best one, and even if it is, there are people who are looking to trying out new tools for the same operation.
For file compression on Linux, as on Windows and Mac, there is no dearth of applications, both closed source and open source, which you can try for free. So, whether you're looking to pack hundreds of photos in a nice zipped file and send it to your friend, or you’re trying to save some valuable space on your disk, there are a lot of nice compression tools you can choose from on Linux.