Staking is not new in the cryptocurrency world. Proof-of-Stake (PoS) concept is that an individual can mine or validate block transactions according to how many coins a trader holds.
KuCoin Soft Staking share this concepts in a fair way. Holding a specific coins that is supported in this program will give reward to the holder daily.
Check more details here: https://kucoinblog.com/what-is-soft-staking-kucoins-new-staking-program-sk-st