Nobody likes to feel overwhelmed, intimidated, or confused by a machine or a Web site, and good information design lets you do what you want to do without ever getting lost.
Information design is critical to achieving goals on a site.
Those may be business goals, user goals, or content goals. From the developer's perspective, good information design is important because it allows you to address priorities, which ideally include user need. Establishing what users are most likely going to want or need, and using information design to facilitate them doing that as easily as possible builds trust and affinity with the users. Respect the User. Although a site should undergo extensive user testing before launch, that's not always possible.