Entertaiment is a vast area of activity, with countless groups, individuals and foundations all contributing to our societal needs. It is a force that can bring joy, stimulate learning and even cause harm. In many ways it is similar to science, which requires a great deal of creativity and perseverance to advance. It is a form of art that has demonstrated a remarkable capacity to cross over different media. It is also a highly adaptable art form, with familiar images and structures resurfacing again and again in different contexts. The word entertainment derives from the Medieval Latin intertenere, derived from the Indo-European root ten, meaning to stretch or extend.