The Friday and Monday immediately surrounding the Easter weekend are public holidays in the UK — or "bank holidays" as we call them. Friday has religious significance: it is Good Friday, an important day in the Christian Easter calendar.
The Monday after Easter is also a public holiday in England, Wales, and Northern Ireland, though it's less religiously significant. Though, as the name suggests, banks do tend to shut on both Good Friday and Easter Monday, most shops, restaurants, and pubs are open. For non-Christians, the four-day weekend may not hold religious significance, but it does offer an opportunity to catch up with family and friends, go on a trip, or get on with jobs around the house. As it's often one of the first sunny weekends of the year, Easter is often the time for DIY projects, garden makeovers, and Spring cleaning — or just sitting in a pub garden with your friends.