Homonym: 셀 (Cellular)
A "셀" (cell) is the basic structural and functional unit of all living organisms. Cells can be classified into two main types: prokaryotic cells, which lack a nucleus and membrane-bound organelles, and eukaryotic cells, which have a defined nucleus and organelles. Cells perform essential functions such as energy production, growth, and reproduction.
Cells are surrounded by a protective membrane that regulates the movement of substances in and out. Inside, they contain various components, including cytoplasm, mitochondria for energy, and ribosomes for protein synthesis. Understanding cells is fundamental to biology and medicine, as they are the building blocks of life.