Active electronic components are devices that can introduce gain or control the flow of electric current in electronic circuits, enabling them to perform various functions essential for electronic systems and devices. The most common types of active electronic components are diodes, transistors, and integrated circuits. These components can perform operations like switching and amplifying signals, regulate power, perform calculations, store data, and so on. In this article, extracted from the book Practical Electronics Crash Course by Dogan Ibrahim, we will be looking at diodes.