Elliptical galaxies are a type of galaxy characterized by their smooth, rounded shapes and lack of distinct features like spiral arms. They are composed mainly of older stars, which gives them a yellowish hue. Unlike spiral galaxies, which have a lot of gas and dust, elliptical galaxies contain very little, making them less active in forming new stars. These galaxies can vary in size, from small dwarf ellipticals to massive giants. They are often found in groups or clusters, where their gravitational pull can influence nearby galaxies. Studying elliptical galaxies helps astronomers understand the evolution of the universe and the formation of different galaxy types.