Bulk or high temperature superconductors are materials that are not perfect diamagnetic, but attain zero resistivity or infinite conductivity below a well-defined temperature known as critical temperature (TC). In the presence of external magnetic field, such material exhibit two critical field values HC1 and HC2. These materials may exist in three different states: superconducting, vortex or mixed and normal state depending upon the intensity of the applied field. The principal application of such SCs is in compact strong and stable field permanent magnets, and the magnetic flux density of these magnets is much higher than conventional permanent magnets. This chapter has discussed various types of high-temperature superconductors, their physical properties, applications, and recent research in the field.