This document discusses different types of beams and beam supports and reactions. It defines a beam as a structural element that can withstand loads by resisting bending. It describes simply supported beams, fixed beams, cantilever beams, overhanging beams, continuous beams, and trussed beams. It also discusses types of loads and notes that the reaction in a beam depends on the type of beam, loads, and supports, with reactions always generated at support ends for forces or couples.