a journal is also called as a book of prime entry.
transactions occured are first entered in this book to show
which accounts should be debited and which should be credited.

on the basis of entries made in the journal, accounts are
prepared, the book which contains the accounts is called a
ledger. transactions entered in the journal are classified
according to their nature and posted in their respective
accounts in ledger. it is also called as book of final entry.

Journal is primary entry book which shows all primary transaction first made in journal & suggest which a/c should be credited or which a/c should be debited.

on the other hand ledger is an a/c which is prepared on the basis of entries made in journals this entry also call as book final entry.

Journal Entry:- It is a process of recording the business 
transactions in the journal is known as a journalising.To 
divide business trancations into two aspects and recording 
in the journal is called 'journal entry'.The first aspect 
is Debit secound aspect is Credit.

Ledger:- Ledger is a set of accounts.It contains all 
accounts of the business enterprise whether 
real,nomial,personal.