ELI5 How can i have multiple public addresses with one private key.

First off I'm using electron cash wallet for some time now.

When i look up my public address(under receiving adress) and type something in the description my public adress changes. Can someone explain how this works?

submitted by /u/brokester
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source https://www.reddit.com/r/btc/comments/fo2s4o/eli5_how_can_i_have_multiple_public_addresses/