human
What are the ways to optimize images for a website?
assistant
The main ways to optimize images for a website are: 
1. Resize the images to the right dimensions for the website.
2. Compress and reduce the file size of the images.
3. Use the appropriate image format (e.g. JPEG/PNG) for the desired effect.
4. Use a CDN or image hosting service to store and optimize images.
5. Use appropriate 'ALT' tags to describe the images.
6. Use CSS sprites to reduce the number of image requests.