Ultrabooks vs Laptops:
1) Portability: ultrabooks are much portable and light in weight when compared to laptops.
Examples for light ultrabooks: Acer S3, Lenovo U300S
2) High battery backup: The battery backup of ultrabooks is high in comparison to laptops. For instance, the battery backup in Asus UX31, Lenovo U300S is more than 6 hours in comparison to regular laptops that need to be charged frequently. The average battery backup of laptops is around 3-4 hrs.
3) Ultrabooks incorporate integrated graphics: The graphics support in ultrabooks is not dedicated as in laptops.
4) Better processors: The best examples of ultrabook processors are Intel Core i5 and Intel Core i7. These are much more advanced computer processors and provide an enriching user experience.
The above explains some of the aspects that you can consider to distinguish an ultrabook from a laptop.