A beaker is a versatile piece of laboratory glassware used for mixing, heating, and measuring liquids. It has a cylindrical shape with a flat bottom and a spout for easy pouring, and it features graduated markings on the side to indicate volume. Made from heat-resistant materials such as borosilicate glass or plastic, it can withstand various temperatures and chemical reactions. They are commonly used in scientific and industrial laboratories for preparing solutions, conducting experiments, and performing routine tasks.