Accounts on the XRP Ledger have their own separate r-address. This is the public address on the XRP Ledger, where funds can be sent to. All non custodial XRP Ledger accounts managed with XUMM have their own random r-address.
When you import your account on another device using the mnemonic / family seed / secret numbers / Tangem card, you will get the same r-address (+ balance & history).
When you want to deposit to your XRP Ledger account (e.g. from an exchange, or by having a 3rd party send funds to your account) you will need to grab the r-address and share it with them.
The XUMM home screen shows your r-address:
There are two options if you want to copy your r-address from XUMM.
Method #1: Tap and hold your r-address on the XUMM Home screen. If you long press your r-address, a copy button will appear to copy your address to your clipboard.
Method #2: Use the "share" icon, displayed slightly to the top & right in the balance/r-address block, and then tap "Copy address".
WARNING! The "Request" button displayed under the balance (XUMM home screen) can not be used to retrieve your r-address ready to be used in e.g. an Exchange Withdrawal Address text input. The "Request" feature is to send a request directly to another XUMM user, and can only be opened with XUMM.