Day book is nothing but journal ledger .{i.e, every 
transaction will be entered in  day book/journal ledger).

journal ledger is also called primary book,day to day 
transactions are entered in journal

Journal is the book of original entry because every
transation is first written in the journal and which it is
posted to the ledger at any convinent time.

journal is a primary book of recording the day to day 
transactions . generally it is just go on entering the 
transaction as soon as events takes place

Ledger is a systematic manner of Segregating transactions 
and entering the transactions i.e 
1) Purchase of Goods---Purchase A/c
2) Sale of goods-------Sales A/c
3) Purchase Return means--Purchase return
4) cash/bank --------contra a/c etc.....

plz rectify

journal  is a book record all the business transaction then 
and there or inorder of data. journal is also called as 
original entry or primary entry.

journal is called the day book.it,s record the transaction 
in chronological order