Difference between pixel and particle

Hey guys, please I need help, can you tell me what is difference between pixel and particle?
Thank you so much

A Pixel is defined as a single dot on your display. It is a physical thing. Your display is made up of a large array of pixels. Exactly how many pixels make up the screen, and the physical size of each pixel, depends entirely upon the specific display device.

A Particle is a programming entity. It is a virtual construct that defines a single object, at a particular point in virtual space. Unity includes a “particle system” (Unity - Scripting API: ParticleSystem), which is used to generate graphical effects like sparks, or smoke. Each “spark” or “puff of smoke” can be considered a particle.