Highlighter

A highlighter is a form of marker pen which is used to highlight sections of documents in a vivid colour, but not intended to obscure the content beneath the marking. As such, highlighter ink is translucent.

Many highlighters come in bright, often neon colours, such as yellow or pink, but also come in plainer colours such as blue, green, or purple.

Word processing software has the ability to simulate highlighting capabilities by using a technique not dissimilar from reverse video on some terminals.