1. A phrase people use because they are apparently unfamiliar with the English language and do not realize it doesn't make sense in most contexts they use it in. Most of the time, they mean for all intents and purposes, which does have meaning; that is, that the reference is practically what the speaker is talking about. An error much like saying "the team should of won" when meaning "the team should have won."

2. Also, very rarely, correct, as in "4 GB of RAM are good for all intensive rendering purposes."

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