An NFT Drop, is basically the initial NFT sale, or the initial launch of the NFT Collection for purchase by the public.
NFT drops usually have a set release date and time, and they are often announced in advance. The NFTs are usually sold on a first-come, first-serve basis, and they are typically sold at a fixed price or through an auction, and frequently the buyer pays the gas fees associated with the mint. Once the NFTs are sold, they can then be traded in the marketplaces.
The concept of drops creates a sense of urgency, scarcity and exclusivity that drive the interest of collectors to participate in the sale and as such the demand for the NFTs can be high, leading to high prices and higher profits!
It is important to note that not all NFTs have the same value, and the prices of NFTs can fluctuate over time, so it is important to do your own research before buying or selling an NFT.