UK finance jargon - in plain English
Moving credit card debt to a new card, often at 0% interest.
A balance transfer is when you move the debt from one credit card to another, usually to take advantage of a 0% introductory interest rate. It gives you a window to pay down the principal without interest eating into your payments.
You owe £2,000 on a card charging 25% APR. You transfer it to a 0% card for 24 months with a 2.5% transfer fee (£50), so you now have two years to clear £2,050 interest-free. Used properly, it can save you hundreds.
Numbers simplified for illustration. Actual rates and tax rules may change.
People forget the 0% deal has an end date. If you haven't cleared the balance when it expires, the remaining debt jumps to the card's standard rate. Note the date, set up a repayment plan from day one.