Image compression is the process of reducing the file size of an image without significantly degrading its visual quality. This is crucial for websites because smaller images load faster, improving user experience and search engine rankings.

There are two main types of compression:

• Lossy Compression: Permanently removes some image data, resulting in a much smaller file size. Best for photographs and complex images on the web. Formats: JPEG, WebP.
• Lossless Compression: Reduces file size without any loss in quality. Best for logos, icons, and images with text. Formats: PNG, GIF.

To compress an image, follow these steps:

1. Choose the right format: Use JPEG for photos, PNG for graphics with transparency.
2. Resize the image: Scale it to the exact dimensions needed on your webpage.
3. Use a compression tool: Many free online tools (like TinyPNG, Squoosh) or software (like Adobe Photoshop, GIMP) can compress images effectively.
4. Adjust the quality setting: Find the balance between file size and acceptable visual quality. A setting of 60-80% for JPEGs is often ideal.

Always save a copy of your original image before compressing. By using compressed images, you ensure your website is fast, efficient, and user-friendly.