The purpose of this literature review is a discussion of three different categories of instructional coaching (teacher-centered coaching, student-centered coaching, and differentiated coaching) and the purposes of each type of coaching model. The review first examines the evolution of coaching and how it was first introduced into school systems. As the first coaching model of peer coaching spread around the nation, refinements were made and new coaching models introduced. Technology has changed the landscape of education, and schools are looking for effective methods to assist teachers in preparing students for an unknown future. The practice of traditional professional development methods is no longer effective in providing teachers the skills they need to prepare students for the ever-changing world. Instructional coaching, when well-designed and supported by administrators, can be an effective way of improving instructional practices and increase student learning.