The CIBIL bureau has specific algorithm to assess your financial records and assign a credit score based on which your creditworthiness is asserted. A credit report on the other hand is detailed report containing facts of your credit history, and credit records, which depict the score and lot more about your financial health.
A credit score on the other hand is simply a three digit number that signifies your financial health or in terms reliability of taking credit. The banks consider this score to grant credit card or loans or reject applications for the same. There are many techniques to improve credit score. The credit report can be checked for any discrepancies, and then if mistakes are found then you can raise a dispute about it with CIBIL.
However, such errors in credit score and report are rare. Sometimes there are cases about identity theft, like loan enquiries made on your name in application, but actually made by someone else. Thus, it is important to get your credit report checked at least once in a year to see if your financial accounts and records were not mishandled, at the same time you will be updated with your current credit score.
A CIBIL report is also known as credit information report (CIR), which has information of individual such as name, address, age, employment status, income details, loan settlements or defaults if any, loan details as in the types of loans taken in past, subsequent repayment timelines for ongoing loans, credit card pill payments defaults if any, details of credit cards for all the cards you have, number of credit enquiries, remarks by lenders, and most importantly the credit score. The CIBIL report comes from CIBIL via customer credit data that is receives from lending entities and banks.