Highlighter pens are marker pens that have a special ink designed to be seen through when writing over existing type, or writing. This is so that you can highlight areas of text that are of interest, or need to be brought to attention. Students who studied information that was highlighted by an instructor remembered and understood more information than students who simply read the text. This is because when the correct information is highlighted, this frees up cognitive capacity to process the new information and connect ideas. You can use the highlighter marker to bring up the most important bits of each paragraph and then use that information to take your own notes. By doing that, you get better processing and understanding of the information you just read.