How To Upload Photos?

I have seen people upload photos, .jpg, .gif onto the internet. I understand that photos have to be scanned into binary files. But, how do I upload them? For example, I have a Yahoo email account. How do I put scanned photos on the http://us.f1.yahoofs.com ?

A Yahoo email account does not necessarily allow you to upload pics to Yahoo. Most sites that allow you to put pics on their turf also provide a way for you to get them there.
For example, http://geocities.yahoo.com/ or http://www.webshots.com/

There are 2 ways:
either the site has some mechanism by which you can upload the files using a servlet (or some mechanism in another language) and it will create a way to view the image (add database entries for the engine or HTML pages on the fly) OR the image is added manually by an admin when you mail it to them.
Addition: before uploading anywhere check the terms of service.
Some sites claim ownership of your work which you upload or claim unlimited and sometimes exclusive distribution rights.
Be very certain of what you sign up for, NEVER sign over the rights to your work and NEVER sign over exclusive rights unless you're paid a lot of money for it!
[ September 20, 2003: Message edited by: Jeroen Wenting ]

If you are a pro in photography (or a good photographer, who happened to have snapped some cool shots), and want to put them online, probly you should watermark them before publishing them, as digital piracy is so easy, you would be sad to see your most favourite shots winning online photo competitions for someone else!

Well, if its just to share normal photos btw friends, you could use http://photos.yahoo.com which will let you create albums and invite your friends to view it online - BUT, yahoo and most other free online photo-album services actually reduce the quality of the photo to some standard like 600x400 (understandably, to save disc space etc) or at times even smaller, leaving your it not worthy showing to others.

Sorry, I keep forgetting to mention things that I wanted to say!
One more thing - if you are a PRO, try www.photo.net - great place to publish your work, and to get comments from other PROs/enthusiasts. And they dont tamper with you pic quality either!

Hmm, thats pretty much it.. I guess!
HTH!!

Photo.net isn't for pros only...
But if you want valuable feedback (which is rare at photo.net unless you're part of a clique) consider http://www.usefilm.com
Smaller, friendlier atmosphere.
And be careful with terms of service.
Yahoo cleaned up their act, but webshots says "As a condition of membership, you hereby grant Webshots a perpetual, universal, nonexclusive right to copy, display, modify, alter, transmit and distribute any materials provided by you to the Webshots community. " meaning they can do whatever they want with your work even after you terminate your account with them including selling it.
Yahoo now puts it correctly as "With respect to photos, graphics, audio or video you submit or make available for inclusion on publicly accessible area of the Service other than Yahoo! Groups, the license to use, distribute, reproduce, modify, adapt, publicly perform and publicly display such Content on the Service solely for the purpose for which such Content was submitted or made available. This license exists only for as long as you elect to continue to include such Content on the Service and will terminate at the time you remove or Yahoo! removes such Content from the Service."
so they will use your work ONLY on the relevant Yahoo website(s) and only while you have the work online.
In the past they used to have a clause even more broad than webshots has now where they claimed ownership of the intellectual property over anything hosted on their servers.