Image optimization is the process of reducing the file size of images without sacrificing quality. This is important for websites and applications because smaller images load faster, improving user experience and boosting search engine rankings. Techniques include compressing images, resizing them to fit specific dimensions, and choosing the right file format, such as JPEG for photos or PNG for graphics with transparency. By optimizing images, you can also save bandwidth, which is especially beneficial for users on mobile devices or slower internet connections. Tools and software, like Adobe Photoshop or online services, can help automate this process, making it easier for anyone to enhance their digital content.