Most Industrial Bubble Column Reactors Require the Utilization of Internal Structures for Heat Transfer And/or for Controlling the Flow Structures and Back Mixing in the System. the Internals Denote All Types of Innards Added to a Bubble Column, Such as Perforated Plates, Baffles, Vibrating Helical Springs, Mixers, and Heat Exchanger Tubes. in Commercial Scale Bubble Columns, Instrumentation Probes, Down-Comers, and Risers with Heat Exchangers Are All Considered. This Review Presents the State-Of-Knowledge of Bubble Columns with Internals. It Starts with an Introduction. the Second Section Discusses the Horizontal Internals, and the Following Section Examines the Studies Involving Vertical Internals.