With some protection products you can choose to have either single or joint life cover.

Single life cover: as the name suggests, will insure you and only you.
Joint life cover: is taken out to cover two people.

Joint life may be a cost-effective option if you want you and your partner to be covered for example. There is usually only one pay out though which is normally made when the first person dies, and after this the cover ends, leaving the other person without cover in the future.