black type E male plug

Type E plugs are used in Belgium, France, Poland, Slovakia, Czechia, Tunisia and Morocco. The pins of type E plugs are 19 mm long and spaced 19 mm apart. A type E plug has a hole in which the earth pin of the socket fits.
Read here what kind of plugs and outlets are used in your country.

Which power cord to use for a type E plug?

This plug is suitable for connecting a three-pole cable. In principle, a two-pole cord can also be used, but as the grounding wire is missing, the appliance will not be grounded.
See the collection of two- and three-pole power cords here.

When to use an earthed plug?

In bathrooms and humid rooms, it is best to use earthed plugs. The same applies to appliances with metal parts, as the risk of short circuits is higher.