How can people use a DVD recorder to their benefits?

it is used to watch movies or dvds or even videos.

A DVD 'RECORDER' is used for recording onto suitable discs, either re-recordable DVD-RW or DVD+RW.

Record once discs are, DVD-R and DVD+R

Most commercial recorders have a TV tuner built in, so you can record direct off Tv, they also have AV sockets so they can be hooked up to another machine and record off an old VHS VCR.

Most modern computers have an optical disc drive that can also record onto DVD's, like video off the computer, they can also store data.