What are the key differences between a symphony and a sonata in classical music composition?

The key differences between a symphony and a sonata in Classical Music composition are their structure and size. A symphony is a large-scale work for orchestra typically consisting of multiple movements, while a sonata is a smaller-scale piece usually written for a solo instrument or a small group of instruments with fewer movements. Additionally, symphonies often have a more complex and grandiOSe sound compared to sonatas.