This course provides a comprehensive introduction to transmission electron microscopy (TEM) as a powerful characterization tool in materials science. It is aimed at beginners and intermediate users of TEM and covers both the theoretical and practical aspects of advanced electron microscopy techniques. By taking this course, students will be able to interpret and analyze TEM data and understand electron microscopy publications. Students will learn the necessary theoretical basis for taking practical training on modern aberration-corrected TEMs. Previously offered as a special topics course. Recommended Prerequisite: Experience on electron microscopy is recommended but not necessary.