Tradelines are credit accounts that someone adds you to as an authorized user, giving you a positive credit history. It's like getting a credit boost without the hassle. Remember, only responsible use is the key to a better credit score.

Here's how it works: A friend or family member with good credit can add you to their credit card as an authorized user. You don't even need to use the card – just being associated with it can improve your credit. It's a legitimate way to enhance your creditworthiness.

But be cautious! Ensure the primary account holder is responsible for their credit. You don't want any negative impact. Also, not all credit scoring models consider authorized user tradelines, so check with the credit bureau.

In a nutshell, authorized user tradelines are like credit score helpers. Boost wisely, and watch your credit score climb.