A shared on-line journal where people can post diary entries about their personal experiences.
Postings on a blog are usually in chronological order and have often have comments from other users

Business's use blogs to communcate with their customers. You use blog to build a stronger relationship with your customers and bring a greater sence of brand loyalty. Customers love to see the insight that goes on within a business, and a blog is the best way to offer your customers better access to your business.