A peak is a top of a mountain.
 
Erosion (wind, rain, sun breaking down the earth) wears down the rock on mountains. When this happens to a top of a mountain, it usually leaves jagged rock with steep cliffs. This is what we think of when we use the landform term - peak.
 

Many times the top of peaks is covered with snow and ice. This is because they usually are located at a high altitude. They could also be located towards one of the poles.

 
Related Terms
volcano - many volcanoes have peaks
mountain - the top of a mountain is a peak
mountain range - would have many peaks

 
 
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