Systems which make watering a little easier
First, what are we talking about here? Drip, or trickle irrigation, generally comes in two flavors. The first is probably familiar: A length of hose with miniscule holes poked into it at regular intervals. This is used a lot for gardening, where the ability to water an entire row with the turn of a knob makes it very appealing.
The second is a specific irrigation system, where watering "emitters" can be spread sporadically down the length of a hose, so individual plants can be targeted. Since this is more specific, you can get water to plants that need it, and (to a certain extent) the amount of water delivered can be adjusted.
The strengths of both systems are many: they are easy to use, deliver a slow, steady amount of water to a specific location, and they can cut down dramatically on weed growth.