Bootstrap is the most popular CSS Framework for developing responsive and mobile-first websites.
A landing page is a standalone web page designed to promote a specific product, service, or offer. Landing pages are used in marketing campaigns to drive conversions and increase revenue, and typically include a clear call to action, minimal distractions, and a focus on the benefits of the product or service.
A template or theme refers to a pre-designed layout or structure that provides a basic framework for building a specific type of application or website. It typically includes good design, placeholder content and functional features, allowing developers to customize and fill in the details according to their specific needs.