Coral colonies are groups of individual coral polyps that live together in a symbiotic relationship. Each polyp is a tiny, soft-bodied organism that secretes calcium carbonate, forming a hard skeleton. Over time, these skeletons accumulate, creating the structure of coral reefs, which provide habitat for many marine species. These colonies thrive in warm, shallow waters and rely on a symbiotic relationship with zooxanthellae, a type of algae. The algae provide energy through photosynthesis, while the coral offers protection and nutrients. Coral colonies play a crucial role in marine ecosystems, supporting biodiversity and protecting coastlines from erosion.