Mobile wallets are like your wallets but on the phone in the form of Apps. They store your bank account details, debit/credit card details to enable cashless payment.
Mobile wallet is different from UPI as the debit for payments is not happening directly from the bank but from the money you add to the wallet. Once it finishes you will need to add more money to your wallet to enable transactions.

Example:
Mobile wallets are like your wallets but on the phone in the form of Apps. They store your bank account details, debit/credit card details to enable cashless payment.
Mobile wallet is different from UPI as the debit for payments is not happening directly from the bank but from the money you add to the wallet. Once it finishes you will need to add more money to your wallet to enable transactions.