Credit repair is the process of disputing negative marks on credit reports to get them removed, which raises your credit score. Credit histories often contain inaccurate or invalid items that damage your score. If you check your credit and your score is lower than you anticipated, it could be because of incorrect information on your credit reports.
If you find information that is incorrect, you can file a dispute. Remember too, that items on your credit report that you don't recognize could also be potential signs of fraudulent activity — someone working to secure credit in your name for their own use. Make sure you're clear on items that could potentially be fraudulent, versus those that may simply be inaccurate.