What are tight junctions?

AKA zonula occludens , cell-cell adhesion characterized by plugged intercellular spaces, occur in the form of a belt, at limit between apical and lateral pole, plasma membrane of neighboring cells fuse with one another at many points due to tight interaction between intrinsic proteins (occludin) In other words, they are formed by the attachment between different occludin belonging to to neighboring cells so they function as a zipper. Actin filaments mat attach to them.