Does polygon only handle transactions, not save data?

Iā€™m confused about polygon & DApps.
Does polygon, Eth etc. DApps save normal data, not a blockchain based data.

transactions can also save data, but it costs more to save data, and usually for nfts the contracts can save a link to an IPFS location for example where more data is saved

are u a group of peoples, because ur active everytime cryptokid ?