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What is the function of the skin in humans?

The skin is the external covering of the body. In humans its main functions are protection, perception of information from the environment,  control of the body temperature and secretion of substances.

What are the tissues that form the skin in vertebrates?

The skin of vertebrates is made of epidermis, an external layer of epithelial tissue, and dermis, a layer of connective tissue under the epidermis. One can cite also the hypodermis, a layer of adipose tissue under the dermis.

Skin annexes may exist in some phyla and classes, like hairs, sweat glands and sebaceous glands.

Besides the skin what are the other coverings of the body?

Besides the skin there are other covering tissues made of epithelium over other tissue layers. They are the tissues that cover the internal surfaces of hollow organs, like the organs of the digestive tube, the airway, the renal tubules, the ureters, the bladder, the urethra and the blood vessels. The glands and the serous membranes are made of epithelial tissue too.