Sub-letting means renting out your room to another person who is not listed on the lease.
You may want to sublet your room in a share-house if you were going to be away for a number of months and wanted someone else to make the rent repayments, or you could sublet a room in your rental property to someone else.

Before entering into a sublet agreement the landlord of the property must consent to the arrangement in writing. When you sublet, the person subletting is known as the subtenant. Subtenants have the same rights and obligations as other tenants renting privately, however because your name will remain on the lease until its expiry, any damage caused by the subtenant or the subtenant’s failure to pay rent will still be your responsibility.

If you are moving out of a share-house but co-tenants are remaining, it is best that you involve them in finding a new person to move in to your room. You could also ask the landlord whether, instead of a sublet arrangement, the person subletting could be named on the lease. If the landlord agrees, the person subletting becomes a tenant and has to adhere to the lease contract.