Weeds pose a significant threat to the productivity of agricultural and horticultural crops. They are a major menace in agriculture and horticulture, causing a reduction in crop yields when they infest plants. Considering these facts, Weed Science is published to provide fundamental information about weeds, as well as control measures, to students, teachers, and individuals involved in agricultural activities. It is not my intention to claim credit for any original contributions on the subject. Rather, this publication should be seen as a concise compilation of various topics from different sources, including books, bulletins, scientific papers, and websites, which are mentioned in the text or in the selected references.