Online teachers may not see their students in person, so they must develop other ways to communicate with them. The teacher must be able to give timely and meaningful feedback to students as they progress through the learning activities. In a face-to-face classroom, teachers may be able to verbally provide clarifications when their directions are unclear to students, but in an online environment, it is more important for clear guidelines to be given from the start of a learning experience.
As part of my studies in the endorsement program, I read about how some teachers used email, Skype, discussion boards, and other means of holding virtual meetings with students. I also had the experience of observing a recorded synchronous lesson and implementing my own. Also in my current placement, I've been able to use the messaging feature in my LMS to answer student questions.
As evidence I have linked the chat log from my synchronous lesson on relationships between parallel and perpendicular lines and a screenshot from my face-to-face message page on Schoology.