In the context of DigitalOcean, a "droplet" is the term for a virtual private server (VPS). The name "droplet" was chosen to reflect DigitalOcean's focus on simplicity and ease of use - a droplet is a small, self-contained computing unit that can be easily created and managed by users.
In general, the term "droplet" refers to a small drop with a round form, such as a water droplet or liquid droplet, or a small, rounded particle - a tiny droplet. The term droplet is very often used in medicine, such as blood droplets, sweat droplets, or microscope droplets, referring to small droplets.