An easement is a registered section of land on a property title that gives an individual the right to use that land, such as for storm water drainage or a shared driveway. Other types of easements typically include phone lines and power lines, although these aren’t always shown on the title.
The majority of blocks will have easements, as they’re required to facilitate sewerage and stormwater drainage. All this means is the individual mentioned in the easement (in this case the service provider) may need to occasionally gain access to the land.
If you plan to build over the top of an easement, you’ll need to seek permission from the individual who holds it, such as the service provider or your local council.