Geosteering Definition, Applications In Oil & Gas
https://youtu.be/PLzpsTjaU0o

Geosteering is defined as “the drilling of a horizontal or other deviated well, where decisions on well path adjustment are made based on real-time geologic and reservoir data. In conventional directional drilling, the well path is steered according to a predetermined geometric plan. The objective is to follow the line as closely as possible. Geosteering is a departure from this convention.
https://www.drillingmanual.com/geosteering-in-oil-gas-drilling-wells/