The main feature of columnar epithelium is that they comsists of closely packed column like epithelial cells .
Columnar epithelium consist of elongated or column like cells. This tissues are mainly found in parts where absorption secretion occur. Some examples of this tissue are inner lining of intestine stomach.
The general characteristic of all epithelial tissue, including columnar is that the cells are closely packed together. Since they form the linings of organs and body cavities, they have at least one side that's not in contact with other cells. They lack blood vessels and obtain nourishment through diffusion.