Usually speaking blogging takes place right within your web browser. You log in to your blog, create a new post, just as you might write an email, providing a subject line or title, and then a body of text beneath.
The problem with writing online is that browsers can and will crash, if you lose your web connection before saving it’s a wrap, all that work gone into cyber space. I am not trying to scare you but by using a desktop blogging application you avoid this happening. You type out your blog post first on your desktop then submit it electronically to your blog.