Greetings friend, as much as token swap takes place also in exchange platforms where a user can exchange one token for another, there is more to it, which is the blockchain part.

On the blockchain level, which is the main factor of this week's topic, it is about exchange tokens from one stage to another (i.e. from test coin to mainnet) in same blockchain or swapping tokens from one blockchain to another blockchain (e.g Steem to Hive). This does occur due to serval reasons ranging from hardfork to migrating to new block. But in all, I congratulate you for your effort. All the best mate.