An interest-only home loan is where the repayments on the loan only cover the interest accrued on the amount borrowed. Interest-only home loans are usually for a set period, after which the loan changes to a principal-and-interest loan. During the interest-only period nothing is paid off the principal.
Typically, this type of home loan has lower repayments in the short term and might provide greater tax deductions on an investment property, but will usually be costlier in the long run.