A bay is a body of water that is partially enclosed by land, often forming a curve or indentation along a coastline. Bays can vary in size and depth, and they are typically calmer than the open sea, making them ideal for activities like fishing and boating. Bays are important ecosystems that provide habitats for various marine life, including fish, birds, and plants. They also serve as natural harbors for ships and boats, contributing to local economies and tourism. Examples of famous bays include San Francisco Bay and Chesapeake Bay.