Temporal KV is a key-value database where a key doesn’t just have a current value. The database automatically remembers how that value changed over time.

In an ordinary KV store, you might write price = 100, then later price = 110, then price = 125. Ask for price and you get 125. The earlier values have normally been overwritten. In a Temporal KV store, all three states stay logically accessible. You can ask for the current value and get 125, or ask “what was price at 10:00 yesterday?” and get 100. The basic abstraction stops being key → value. It becomes key + time → value.