Bitcoin wallet address:
A Bitcoin address is a single-use token. Like e-mail addresses, you can send bitcoins to a person by sending bitcoins to one of their addresses. However, unlike e-mail addresses, people have many different Bitcoin addresses and a unique address should be used for each transaction.
Bitcoin Wallet ID
A Wallet ID (also called your Wallet Identifier) acts similarly to a username you'd use to access your email, or log into Facebook. To log into your wallet, you'd use your Wallet ID, password, plus any form of Two Factor Authentication you've enabled.
It looks like a string of letters and numbers, like the sample Wallet ID below:
A Wallet ID is only used for the login process, and it's different from a bitcoin address. In other words, it can't be used to send or receive funds. For security reasons, we strongly recommend you don't share your Wallet ID publicly, or with anyone.