Fluorescens is a phenomenon where certain materials absorb light at one wavelength and then emit it at a longer wavelength. This process occurs almost instantaneously, meaning the emitted light stops as soon as the excitation source is removed. Common examples of fluorescent materials include fluorescent dyes and minerals like fluorite. Fluorescens is widely used in various applications, including fluorescent lamps, which convert electrical energy into visible light. It is also important in scientific fields, such as biochemistry, where fluorescent markers help visualize biological processes. This property is essential for techniques like fluorescence microscopy.