Navigation aids, such as a site map should help visitors to navigate a site if they are lost or need to find a specific page. A site map is also very useful purely for SEO when helping search engine crawlers to navigate your website.
A review contains a critical evaluation of an object (place, person or thing) on the basis of a users’ personal taste. Users want to share their opinion about something. By writing a review they can argument why their experience is positive or negative which provides much more detail then a rating only.
Rating systems are commonly used to allow users to leave their opinion on a real product or a virtual object with a minimal interruption to any other task flow they are involved in.
If retailers have a potential customer visiting their site with the sole purpose of locating one of their (nearest) physical stores, the experience must be simple, quick and helpful or the user might go to one of the competitors.
Users need to get confirmation after placing an order. They need feedback on their purchase process.
You want to bring related information or content on your website to the attention of your visitors.
You want to provide shortcuts to areas deeper in the navigation structure or extra secondary functionality on each page.
The user needs to be able to find out what the website has to offer and find what they are looking for.
You need to provide feedback about the user’s location within the website structure and allow to navigate back to a higher level.
The user needs to navigate through a two-level interface with multiple options.