Lehrbuch vs. Schulbuch
The German words Lehrbuch and Schulbuch both translate to textbook, but they are not always interchangeable. The key difference lies in the educational context for which the book is intended, with Schulbuch being much more specific than Lehrbuch.
Lehrbuch
A1A Lehrbuch is a general term for an instructional book used for learning a specific subject. It can be used in a wide range of contexts, including university studies, vocational training, professional development, and even self-study. This word emphasizes the book's purpose of teaching (lehren) a topic in a structured, often academic, manner.
Für mein Chemiestudium brauche ich ein spezielles Lehrbuch zur organischen Chemie.
(For my chemistry studies, I need a special textbook on organic chemistry.)
Er lernt Japanisch im Selbststudium mit einem guten Lehrbuch für Anfänger.
(He is learning Japanese through self-study with a good textbook for beginners.)
In der Berufsschule verwenden wir ein Lehrbuch für Elektrotechnik.
(In vocational school, we use a textbook for electrical engineering.)
Dieses umfassende Lehrbuch der Psychologie wird auch von Fachleuten geschätzt.
(This comprehensive textbook on psychology is also valued by experts.)
Schulbuch
B1A Schulbuch is a textbook specifically designed for use in primary or secondary school (Schule). These books are tailored to a specific age group and educational curriculum, and they are often officially approved by a state's ministry of education. The use is strictly limited to the school environment from elementary to high school.
Die Kinder bekamen am ersten Tag ihr neues Schulbuch für Mathematik.
(The children received their new textbook for mathematics on the first day.)
Der Verlag hat ein neues Schulbuch für den Biologieunterricht der 7. Klasse entwickelt.
(The publisher has developed a new textbook for the 7th-grade biology class.)
In meinem alten Schulbuch für Geschichte sind viele Notizen von mir.
(There are many notes from me in my old textbook for history.)
Ein Schulbuch muss vom Kultusministerium zugelassen werden, bevor es in Schulen verwendet werden darf.
(A school textbook must be approved by the Ministry of Education before it can be used in schools.)
Summary
In summary, while every Schulbuch is a type of Lehrbuch, not every Lehrbuch is a Schulbuch. Schulbuch is specifically for primary and secondary schools (Schule), whereas Lehrbuch is a broader term covering all levels of education and self-study, including higher education and professional fields.