A smart contract is a program that is deployed to the blockchain. A smart contract also has a monetary balance, and can use code in order to receive and transfer funds.
An NFT is a type of smart contract, which can contain multiple tokens. A token is simply any type of digital asset.
Polygon and Ethereum
On most NFT marketplaces like OpenSea, your tokens are added to the marketplace collection, and cannot be transferred to another marketplace. You are limited by the functionality and constraints of the platform.
But when your smart contract is deployed via SweatyNFT, you become the owner of a full ERC-721a compliant NFT smart contract, which can be imported into OpenSea or other compatible marketplaces. Being an ERC721a, the gas fees will be lower for minting than a standard ERC-721.
The Tezos blockchain is an energy-efficient blockchain that has lower gas fees than Ethereum. Popular Tezos marketplaces include Objkt and Rarible. In the Tezos ecosystem, the FA2 standard is used for NFT collections.
With your own contract, you can also sale your tokens on the storefront, and users can lazy-mint tokens at whatever price you set.
Lazy minting has two big advantages. First, it allows you to offload the minting gas fees to the buyers. For blockchains like Ethereum, this can result in tremendous cost savings for the artist. Secondly, lazy minting allows you to sale the tokens at whatever cost you like. So if you sell a collection of 10,000 NFTs for 0.01 ETH/MATIC/TEZ each, you can earn a huge profit for yourself!
After tokens are minted, they will appear on the marketplace, and the new owners can put them up for auction for secondary sales.