Beakers are simple, cylindrical glass containers commonly used in laboratories for mixing, heating, and holding liquids. They typically have a flat bottom, a spout for easy pouring, and are marked with volume measurements to ensure accurate measurement of liquids. Beakers come in various sizes, ranging from small to large, and are made from heat-resistant materials like borosilicate glass. While not precise instruments for measuring exact volumes, they are versatile and widely used for tasks like stirring, heating, and transferring substances in scientific experiments.