Noob pleb here. Doing research now to figure out about this signet thing.
Discussion
Signet is a kind of testnet.
Its another bitcoin networks, where the coins don't have any value and it is used to test things out.
Signet compared to testnet is centralised testned that where blocks are generated by 3 people.
Why would anyone do this?
Well when using testnet there are a lot of problems because of hashrate coming and leaving, so in signet you have consistency.