How do single-page applications (SPAs) differ from traditional multi-page websites?

SPAs take longer to load initially. However after that initial load, navigation is very quick and they are more interactive. Think of a desktop app but on the browser. Traditional multipage websites excel at quick loading the initial page, think about blogs, e-commerce, news sites. However, they are less interactive and navigating within the website is slower. Development and deployment varies depending on the tools used.