Underlined/Coloured text

Why does some text in the website underlined and in a different colour?

Text that appears in this way is hyperlinked. This means that if you click/tap on this text it will take you to another page on the Crouch End & District U3A website or to an external website. If you click/tap on the name of a person on the Groups pages which is underlined and in a different colour, you will be able to send an email to her or him.