Look at the structure in the picture below What function does the structure have?

The structure in the picture shows arms of an octopus.

An octopus has six or eight arms and perform several functions such as:

Octopus arms are helpful for walking in the ocean or water surface.Each arm has suc.kers that help to trap prey and defending them from attackers.Suc.kers on each ars help it to taste the food and even crack the hard shells of creatures in water.