Geysers are a sign of water. More and more scientists and astrophysicists are stepping forward to say that where there is liquid water there is a pretty good chance of finding life.
Water, as you probably already know, is two parts Hydrogen (the most abundant element in the universe) and one part Oxygen. These elements are the core foundations for life and do indicate that there is a great chance that we could at least find microbiological life.
So not quite like the alien films (hopefully anyway), but not that dissimilar from our own planet.
See below to find out how geysers work:
Water in such a system can reach incredibly high temperatures (and store incredible amounts of energy as a result) before it starts to boil. As the magma at the base of the geyser transfers heat throughout the system, more energy gets trapped in the water. Eventually, pockets of water begin to reach their boiling point and become turbulent. This turbulence pushes a relatively small quantity of water out of the opening of the geyser, decreasing the amount of pressure on the water remaining in the geyser. With this sudden pressure drop (and corresponding drop in boiling point), the water in the geyser flashes into steam. The steam quickly expands to 1,500 times the volume of water and this expansion violently pushes water and steam from the mouth of the geyser in an eruption. These eruptions last as long as the water in the geyser remains hot enough to push water out of the geyser opening. Eventually, the entire system will either run out of water or the water will cool down enough for the eruption to stop. The cycle, of course, starts all over again.