It is part of the lease, deed or will which defines the scope of the interest granted and also the condition that can affect the grant.
The clause is also called “to have & to hold” and it can be part of an agreement where you can describe the rights and interests of the grantee.
In UK real estate transactions, the clause can be used to articulate the ownership rights that will be granted to the buying party upon the execution of the agreement.
It can be used to mention by the property advisor as a restriction on a property while investing in real estate. It is one of the real estate terms seldom used in everyday transactions.