In short, a glacier is an enormous mass of ice and snow that forms when the amount of snow that falls is greater than the amount that melts.
Glaciers usually move slowly from mountain slopes or through valleys. When the end of a glacier reaches the sea, it breaks into icebergs.
It is no surprise that the largest glacier on the planet is in Antarctica, the famous "frozen continent". There are a lot of huge glaciers in Antarctica, some more than 160 km long. The largest of them all is the Lambert Glacier.
This huge ice sheet is about 65 km wide, and stretches 435 km long. Imagine the Lambert Glacier as a gigantic sea of ice moving from Paris in France to Amsterdam in Holland.
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