What are the advantages and disadvantage of chalkboard?

Advantages of chalkboards include their low cost, ease of use, and the ability to easily erase and reuse for different lessons. They promote interactive learning, allowing for spontaneous note-taking and drawing. However, disadvantages include dust production from chalk, which can be a health concern, and the potential for legibility issues if not maintained properly. Additionally, chalkboards can be less visually appealing compared to modern digital displays.