Your Bitcoin(BTC) and Litecoin(LTC) wallets generate a new wallet address after every transaction and your total balance may be spread out over multiple different wallet addresses.
Your XPUB address allows you to track all the different wallet addresses generated and can total your entire balance across all the wallets.
We do not recommend sharing your XPUB address to other users as it can be used to track your entire activity on the blockchain, giving away your anonymity.
You can find your XPUB address by opening your BTC (or LTC) wallet. Tapping on "RECEIVE" and then 3-dots in the top right.