More commonly called the boiling point, it is temperature at which a substance in liquid state boils. This happens when the vapor pressure (created by the evaporating liquid) is high enough to be equal to the surrounding (usually atmospheric) pressure. At this point the temperature of the liquid will remain at the boiling temperature: any heat (such as a fire warming up water) will be used up only on evaporation and not on raising the temperature of the liquid.
You also may have been referring to the sublimation point, temperature at which a solid evaporates into gas without going through the liquid stage (such as dry ice going into gaseous carbon dioxide).
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