Tell people what you've been up to and any exciting developments to your company. You can post press releases with or without images. In the news module you are not inviting conversation or comment you are purely telling people what you want to tell them. It's a great way to keep your site content fresh which helps push you up on google rankings.
If you want people to join in and post comments - have a look at the blog module, this might suit you better.
If there is anything you don’t understand please visit our Jargon Buster and type in the word you are unsure of, we’ll be happy to let you know what it means.