Porous coordination polymers (PCPs) or metal-organic frameworks are researched as a promising class of porous materials with exceptional structural and chemical tunability. As a result of their constructed design and fascinating structures, PCPs also have several other qualities, including stability, porosity, tunability, and particle shape, which may all be altered for different uses. Therefore PCPs have drawn a lot of interest from chemical researchers. Here, this chapter provides a general introduction about porous coordination polymers and their structural aspects, as well as applications in a variety of fields.