Ice climbing is the recreational activity of climbing ice formations such as icefalls, and frozen waterfalls. (Dry-tooling is climbing rock using the tools for ice climbing.) Depending on the slope and texture of the ice, different equipment and techniques can be employed by the climber. For example, on flat ice, almost any good hiking or mountaineering boot will usually suffice, but for serious ice climbing double plastic mountaineering boots (or their older stiff leather equivalent) are usually used, which must be crampon compatible and stiff enough to support the climber and maintain ankle support. On short, low angled slopes, one can use an ice axe to chop steps. For longer and steeper slopes or glacier travel, crampons are mandatory for a safe climb. Vertical ice climbing is done with crampons and ice axes (generally called ice tools if they are specific to vertical ice); the climber kicks their legs to engage the front points of the crampons in the ice, and then swings the axe into the ice above their head. This technique is known as front pointing. The strength of the ice is often surprising; even if the axe only goes in a centimeter or so it is enough to pull up on. If the climber is leading, they will need to place ice screws as protection on their way up (see climbing system).
Most mountaineers would only consider the last scenario true ice climbing; the less steep variations are routine aspects of winter mountaineering.
Via: WIkipedia
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