A Lifetime mortgage involves taking a type of mortgage which does not require monthly repayments, although with some plans rather than roll up the interest you can opt to make monthly repayments if you wish.
You retain ownership of your home and interest on the loan is rolled up (compounded). The loan and the rolled up interest is repaid by your estate when you either die or move into long term care. If you are part of a couple, the repayment is not made until the last remaining person living in the home either dies or moves into care, meaning that both you and your partner are free to live in your home for the rest of your lives.