Pension release simply means withdrawing money from your retirement savings. As long as you are 55 or over and have an eligible scheme then current government rules mean you can withdraw as much money as you like from your pension pot. The first 25% withdrawn is usually tax free. After that, any withdrawals are subject to income tax at your marginal rate.
Pension release is a big decision, though, as this is money you have saved up for when you say goodbye to the 9 to 5. It isn’t right for everyone because it will leave you worse off in retirement. That’s why it makes sense to talk with a financial adviser first.