Thanks for the replies, seems Imgur is a fan favorite

Somebody enlighten me...what is the deal with these photo sites that everyone is talking about? Photobucket...which I see a lot of on the forums, usually with no photo there though. I’ve never used any of them or had a use I guess. Why is it a big deal? Can’t you just upload photos straight from the computer, table, phone etc? School me please.
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I just use google photos, free with my google email accounts.
At the most basic level, which is what you seem to be asking, a hosting site is a place on the internet that stores your pictures and allows you to post them on forums and such by inserting a link to your picture.
The problem (and the reason I do not use one) is that the continued availability of your pictures depends on the whims and reliability of the hosting site you selected. As the recent Photobucket disaster showed, that can be all bad.
Attaching your photos directly to your posts avoids the middle man. It does have limitations: five photos per post, pictures not embedded in the text (which I prefer, as it restrains those folks who don’t know how to edit a reply with quote), and you have to click on the thumbnails to see full size photos. But the pictures remain as long as the forum exists.
Some don't like that there is a pixel and filesize limit on the pictures that are hosted by the forum. I don't know if that is because they are lazy in their image editing habits, or because they think the quality has been compromised. Think stereo snobs.
IMHO a 300k, 1024x768 picture is plenty good enough with proper cropping and filesize management. Hosted fullsize pictures are largely a waste of bandwidth.