Most medium to high-end digital cameras will offer you a choice of file formats in which to save your images. The most popular formats are JPEG, TIFF and RAW.
TIFF files will always be higher quality than JPEGs, and JPEG files will always be smaller than TIFFs. The main problem with TIFF files is that they are huge, which will cause your camera to slow down when trying to write your images to the memory card, it means the number of images you can capture in 1 minute will be much less with TIFF than with JPG. However, if you're going for the highest quality image you can capture, the RAW format is a much better choice than TIFF, because it is much more versatile and often smaller. RAW files contain the most information - like capturing 4096 shades of gray instead of only 256, and allow for the most versatility when it comes time to open your image in Photoshop. *Bear in mind that Raw files are just the raw sensor data, it isn't a picture until it is processed further.
Choose JPEG when you either need to fit a large number of images on a storage card or when capturing fast action. Only choose RAW when you need the highest quality possible and don't mind having to spend some time in Photoshop adjusting the images and no need to shoot as rapidly as with JPEG. Choose TIFF only when there are no choice of RAW format but required higher quality than JPEG.
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