Permanent resident status in UK provides any person with valid work visa or student visa to stay in the UK indefinitely. It is a lasting solution to avoid repeated paperwork and hassle of renewing visas to support a legal stay. It is an opportunity to acquire this permit to ensure your presence in the country is approved formally by the immigration system.
You can also pursue higher education, work or conduct business in the UK, without any violation of immigration laws and without any pressure or deadline to leave.