How do seedless grapes grow if they are seedless?

The majority of grapevines in production today produce seedless grapes (due to popularity), most fruits today do not come from seeds they come from cuttings instead. A piece of another vine or branch is cut off, dipped in rooting hormone and then planted in moist compost so that roots form and a new vine is formed. Because the new grapevine has come from cuttings, they are essentially clones of the original vine they were cut from. It should be noted that seedless grapes actually do contain seeds later in their life, but a genetic error prevents the seeds from forming hard outer coats like normal seeds do.