b53ca6bc____Western_Illinois_University__High_School_Teachers
[College Professors] Professors may not follow the textbook. Instead, to amplify the text, they may give illustrations, provide background information, or discuss research about the topic you are studying. Or they may expect you to relate the classes to the textbook readings. [High School Teachers] 
Teachers present material to help you understand the material in the textbook.
Differences Between College and High School - UAASC - Western Illinois University