The Civil Partnership Visa (also known UK as the UK Civil Partner Visa) is a kind of family visa for the UK, just like the spouse and Unmarried Partner Visas.
It allows foreign nationals to live permanently in the UK with their British or Irish partners, with the ultimate goal being to apply for indefinite leave to remain.
There are many similarities between these visas. For example, the requirements to apply and the activities you can perform in the UK with them.
But unlike marriage or any other kind of connection, the UK Proposed Civil Partnership visa is valid just for couples who are in a legally binding civil partnership.
With a civil partnership visa, you can enter the UK for a maximum of two years and nine months. Then, it can be extended for an additional two years and six months.