While it's a good to photographs in RAW, the preferred method to save that image is as a TIFF. What a TIFF is physically is a layered file that, as you open an image in Photoshop or Lightroom or any editing program, you can save the individual adjustments you've made in the file. If you saved it as a JPEG, it's all going to be collapsed down and just be the final image.
So TIFF is a really preferred lossless format for high end photographers or anyone doing professional photography, because you can always go back, and look through that image again, and see the changes you actually made, and tweak them further.
While TIFF is a preferred method to save images, it is not a good method for really anything else. Some cameras will let you shoot in TIFF; it's not really recommended. You're not going to be able to upload a TIFF to Facebook, or Twitter, or anything like that, or Flickr. It's more of sort of an archival file to hold on to, whereas, again, a JPEG is going to be the file that you're going to want to pass around.
The other thing is because TIFFs are saving so much data, they are absolutely gigantic. Again, a very bad reason to try and upload them to a website.
That's everything you need to know about TIFFs.