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Because the bottom is hotter, it is also more fluid and has a tendency to sag, forming a shape like a spinning top which makes it unstable on flat surfaces.
Giving a bottle an arched shape at the bottom means that if it does sag, it can do so without touching the bottom.
These are usually some type of embossed letters, symbols, and/or numbers which were molded onto the base of the bottle for a variety of glassmaker determined reasons.
Julian Toulouse's 1971 book entitled Bottle Makers and Their Marks. (Though long out of print there is a reprint available - click Bottle References for details.) In addition, David Whitten maintains an exceptionally useful website of bottle (and insulator) makers marks at this link:
For more information on the subject of glassmaker markings see the Makers Marks page, which is a sub-page linked to the Glassmaking & Glassmakers page.
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The base of a bottle typically only has one primary function (besides helping hold the bottle together) and that is to provide a flat surface for the bottle to stand upright.