PreSalt refers to geological formations that exist beneath salt layers, typically found in offshore oil and gas reserves. These formations are significant because they often contain valuable hydrocarbons, making them important targets for exploration and extraction. The salt acts as a seal, trapping oil and gas in the underlying rock formations. Exploration of PreSalt regions has gained attention in places like the Brazilian offshore, where large reserves have been discovered. The unique geological conditions in these areas can lead to substantial energy resources, prompting investments and advancements in extraction technologies to access these hidden reserves efficiently.