The term cell is used in various fields: in biology and in high-tech.
A cell is the basic unit of all organisms (except viruses). The cell membrane separates it from the exterior in the case of single-cell organisms, and from other cells in the case of multi-cellular organisms, making the cell an entity.
In radio-communications, an area is divided into a network of cells which are assigned a set of frequencies that are non-reusable in adjacent cells.
In biology, cells (with the nucleus shown in pink) can assemble to form multicellular organisms. © BlueRidgeKitties, Flickr, CC