A two-way mirror is a mirror with two mirrored surfaces, often used for makeup, shaving, or other activities that require close inspection of facial details. One mirror provides normal reflections, while the other provides magnified reflections for better viewing of details such as pores, skin imperfections, etc. Two-sided mirrors are usually designed to be portable and easy to carry and use. They come in a variety of shapes and sizes to suit different scenarios and needs.