Ledger is a collection of entries of debits and credits and in general it is kept in a form of book or some excel sheet etc. which can be destroyed easily.
For example:- The owner of a house has property documents in a file and someone changed it physically and make himself/herself the owner of same house.
But when it comes to blockchain that mischievous person has to change that block of ledger as well as the block comes after it because the hash of each block is linked to the next block come after it.
Since present hash is calculated using the previous hash,so if you are changing the present hash you need to change the next hashes otherwise the chain will not approve your calculated hash.In this way the blockchain has a property of Immutable ledger.
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