Not everyone uses signatures for their daily email, but many people find it invaluable. You can use anything from a simple name or favorite saying all the way up to including contact info and work position. Or, you can do anything in between.
Creating a signature in the native Gmail app in Android is dead easy, just launch Gmail and go to Menu > More > Settings > Signature. So far, you can only have one signature per account, but you can create different signatures for each Gmail account you have. Perhaps this is a feature Google will include in a future update (which should be much easier now that Gmail is a stand-alone app), but we will all have to live with just one signature for now.
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