Leechers are people who download files from the internet without uploading any themselves. This creates an imbalance on file-sharing networks and can make downloading speeds very slow for everyone else. Leechers often use special software to download files faster or to hide their identity, and they may also deliberately spread corrupt or fake versions of files in order to waste other people's time. Some leechers do eventually upload some files, but many never do. If you're downloading a lot of files and not uploading any, you're probably being a leech. And that's not cool. Try to be more considerate by sharing some of your own files every once in awhile.