How do I use images outside my website?

Sorry if this is a redundant question.

I just want to know, if it's possible to do, how to have images from my website be viewable on other sites.

For example, blogs usually ask for the url of a picture in order to post it. I want to know how I can use my website as a sort of image host in order to bypass sites like photobucket. I want to use say, http://mysite.com/image.jpg on wordpress or something.

Is this possible? Does it have something to do with permissions?

Forgive my complete lack of knowledge on the subject.

Thanks in advance.

 

is there any way I can protect my image but also be able to use them myself?

 

Thank you very much.