These are valid addresses that contain readable addresses. For example: 1BingoAuXyuSSoYm6rH7XFZc6Hcy98zRZz is a valid address that contains a readable word (Bingo). Generating a vanity address needs creation and testing of millions of private keys, until the desired Base58 letter address is found.
The vanity addresses are used for fun and offer the same level of security as any other address. The search time for a vanity address increases as the desired pattern's length increases.
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