Essentially, QROPS is a way of moving your UK Pension arrangements to a scheme administered outside the UK, which is more flexible and easily accessible for people who have retired abroad or are planning to do so.
QROPS are a relatively new retirement concept and started as a result of changes to the Pension industry in April 2006. Most QROPS work in the same way as UK pensions in that a pension administrator (trustee) will manage the pension scheme on your behalf and for a QROPS, the trustee must be based outside of the UK.