In bittorrent, leeching is only downloading, while not sharing pieces of what you have downloaded with others. This is, however, luckily practically removed by the use of a tracker, which moniters your up/down ratio and speeds up your downloads if you upload more, or even doesn't let you download at all if you don't mantain a certain quota.
More generally, it is used as a term for certain types of bandwidth theft.
In onlinecomputer games (especially role-playing games), leeching refers to the practice of a player joining a group for the explicit purpose of gaining rewards without contributing anything to the efforts necessary to acquire those rewards. Sometimes this is allowed in an effort to powerlevel a player. Usually it is considered poor behavior to do this without permission from the group.
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It is doubtful whether the medicinal leech, Hirudo medicinalis, which is rarer in England than on the continent of Europe, or the horseleech, Aulastoma gulo, often confused with it, has the best right to the original possession of this name.
Leeches without biting jaws possess a protrusible proboscis, and generally engulf their prey, as does the horseleech when it attacks earthworms.
Leeches are usually olive green to brown in colour, darker patches and spots being scattered over a paler ground.