Cuaderno vs. libreta
Both 'cuaderno' and 'libreta' are Spanish words that translate as 'notebook' or 'notepad' in English. They are quite closely related, but there are minor differences in their usage and how they are perceived.
Cuaderno
A 'cuaderno' generally refers to a notebook or exercise book typically used in academic or professional settings. It is usually larger and contains more pages than a 'libreta'.
Necesito un nuevo cuaderno para mi clase de matemáticas.
(I need a new notebook for my math class.)
Su cuaderno estaba lleno de notas y diagramas para su proyecto de investigación.
(Her notebook was filled with notes and diagrams for her research project.)
Libreta
Libreta refers to a small, compact notepad or booklet typically used for less formal purposes such as jotting down reminders or shopping lists.
No olvides llevar tu libreta al supermercado.
(Don't forget to bring your notepad to the supermarket.)
Necesito encontrar mi libreta de direcciones para enviar las invitaciones.
(I need to find my address book to send out the invitations.)
Summary
In summary, while both 'cuaderno' and 'libreta' can refer to types of notebooks or notepads, the former tends to suggest a larger, more formal academic or professional usage, while the latter suggests a smaller, more informal book used for quick notes and reminders.