This document discusses different types of online tutoring services. It describes asynchronous tutoring which does not require real-time interaction and synchronous tutoring which does. It evaluates three popular online tutoring providers: Chegg Tutors, Tutor.com, and Smarthinking. Chegg Tutors offers the best rates but cannot integrate with learning management systems (LMS). Tutor.com allows one-on-one learning solutions and experts are available 24/7. The online tutoring market is expected to grow significantly due to increased flexibility of online learning.