The various names can make this quite confusing. The correct name for a loan over a property is a Mortgage Loan. When you take out a mortgage loan you "promise" your property as security to the lender in case you cannot pay back the loan. The Mortgage Bond is the document that you sign that contains this promise. The terms "mortgage" and "bond" therefore usually mean the same, and are used interchangeably.
When you buy a property and get a loan with a mortgage lender, the house is yours. It is registered in your name and you are fully responsible for it.