Blockchain is a digital ledger which records of all bitcoin and other crypto transactions in chronological and publicly. There are so many crypto wallets out there which does crypto transactions and keep its records. But Block chain is the one stop platform that records every transaction that happens within the crypto exchange.
Some bitcoin wallets doesn't specify the transaction details immediately whenever you do transferring bitcoins from one wallet to another and receiving bitcoins from block trades and some other traders etc. It takes several minutes to update the transaction details.
But when it comes to blockchain it records every transaction that happens within the crypto network and it shows the status whether your transactions are verified or not. You can simply check what are all the transactions you done with your bitcoin wallet.
To do that, go to blockchain.info website and enter your bitcoin address in the search field and hit enter button. As soon as you search with your bitcoin address you will see the previous transactions like sending and receiving bitcoins data and ongoing transactions too.
So when there is no specific information about your transactions on your bitcoin wallet, you can check them on the blockchain website.