It is possible to have an equitable mortgage or equitable charge, which can arise in a number of different ways, for example by an enforceable agreement for a legal mortgage or charge, a form of mortgage or charge which does not take effect in law, or by a mortgage or charge over an equitable interest only.
Mortgages and charges should be distinguished from other similar forms of security such as liens, which give a right to retain possession of property until the debt is paid, or pledges, which involve the delivery up of possession of property pending repayment of the loan.