Leasehold is where you buy the property, but not the land it sits on. The land is still owned by the freeholder, who is selling the property for a set period of time. It’s more common with flats, but there are leasehold houses too.
Leaseholds usually last between 125 and 999 years. If you buy a leasehold property, you might be able to extend how long you own it for. Shared spaces, like gardens and hallways, are the responsibility of the landlord.
This means if there’s any damage or work that needs doing, they will usually sort it out. You’ll pay them a service charge to cover this. You’ll also pay ground rent.