Before we define what a geogrid is, let's take a look at the larger category of geosynthetics. A geosynthetic is a synthetic product, usually made from or including polymeric materials, that is used to solve civil and geotechnical engineering problems in or on the ground. Geosynthetics add to or enhance the functions of conventional materials to make construction more efficient, cost-effective, and reliable. Designs using geosynthetics should be based on the function(s) of the selected materials to meet the engineering objective(s).

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Geogrids were invented by Tensar in the late 1970s and are a category of geosynthetic material that can be used to provide the functions of reinforcement, stabilization, and filtration.