1) Personalization enhances the visitor experience on a website by tailoring certain functions based on predefined user factors like profile, preferences, and behavior.
2) There are different types of personalization including explicit, implicit, adaptive, and hybrid approaches. Measurement of website usage is also important through analytics to understand user behavior and optimize the experience.
3) Trends in personalization and measurement include rise of mobile, behavioral targeting, big data, and more integration of data sources for more sophisticated analysis and personalization. Understanding user context is key to making metrics truly meaningful.