Centuries ago in Europe, books were regarded as status symbols. Before printing became widespread in the 15th century, books had been luxuries only the privileged could afford. Having books meant the owners were not only wealthy, but also literate.
Bookbinding began in the 4th century (soon after the codex replaced the roll), in order to make books more durable, as well as more attractive. Some of the earliest bindings for church-altar Bibles were elaborately decorated with jewels, gold and embroidery.
Though bookbinding is done by machine today, books in temporary paper bindings -- allowing for custom binding at a later date -- are still commonly sold in Europe; professional bookbinders are hired to create original volumes. Some people even enjoy creating their own bookbinding.