Built-in Particle System

Unity’s Built-in Particle SystemA component that simulates fluid entities such as liquids, clouds and flames by generating and animating large numbers of small 2D images in the scene. More info
See in Glossary allows you to create effects for every platform that Unity supports. The Built-in Particle System simulates particle behavior on the CPU which allows for the following main benefits:

• You can use C# scriptsA piece of code that allows you to create your own Components, trigger game events, modify Component properties over time and respond to user input in any way you like. More info
  See in Glossary to interact with a system and the individual particles within it.
• Particle systems can use Unity’s underlying physics system and thus interact with CollidersAn invisible shape that is used to handle physical collisions for an object. A collider doesn’t need to be exactly the same shape as the object’s mesh - a rough approximation is often more efficient and indistinguishable in gameplay. More info
  See in Glossary in your SceneA Scene contains the environments and menus of your game. Think of each unique Scene file as a unique level. In each Scene, you place your environments, obstacles, and decorations, essentially designing and building your game in pieces. More info
  See in Glossary.

For more information on how to use the Built-in Particle System, see the Particle System component.