A friend once asked about this, so I’ll try to explain it in plain language.
A single set of seed words can derive the private keys for every address in the wallet. Knowing the seed words is like having access to the entire wallet.
You can think of the seed words as the wallet’s “master key”: every address’s private key is derived from them, so they’re more important than any individual private key.
By the way: $BTC is at 80257.19 (24h -0.52%).
If you have a friend who’s just getting into crypto, feel free to send this to them.