Soil reinforcement is an effective and established method for enhancing in-situ soil behaviour. Soil reinforcement using geosynthetics is one of the most economical and sustainable options used nowadays. One of the most emerging solutions available among them is soil reinforcement using geocell. The majority of the geosynthetic materials are planar in geometry whereas cellular confinement systems add a third dimension to geosynthetics which opens a wider range of applications of geosynthetics in the Geotechnical engineering field. Geocell is a three-dimensional geosynthetic material made of polymeric strips such as high-density polyethylene that are connected at intervals using high-quality ultrasonic welding. Many researchers have studied the suitability of geocells for improving load carrying capacity of weak soils under foundations, pavements, and embankments. Geocells are used as a barrier on slopes and riverbanks to prevent soil erosion-related problems and are used in retaining structures as a gravity retaining structure or as a facia element for reinforced earth walls. The effectiveness of geocells has been established by researchers in the past through full-scale case studies, small-scale model tests, and numerical studies. Also, the reinforcement mechanism of geocell-reinforced soil and analytical methods for calculating the bearing capacity are explored by many researchers based on experimental studies. This paper aims to provide an understanding of some of the practical applications of the geocell in Geotechnical engineering with an emphasis on analysing the primary working mechanism, load distribution, and failure mechanism of geocell-reinforced geotechnical structures. Furthermore, this paper includes a comprehensive review of past physical model studies and numerical modelling techniques.