Spot
Spot trading means you're buying or selling an asset immediately. This is opposed to trading futures (a.k.a. options), which is the right to buy/sell an asset at set price at some future date.
If you go onto an exchange (such as Coinbase) and purchase Bitcoin, then you're spot buying bitcoin. Same if you go to a bitcoin ATM and purchase them.
Spot trading is the main way investors trade cryptocurrencies and stocks.