Why Equilibrium Exist

Why equilibrium exist?

graph TB A[Why equilibrium exists?] B[Chemical Reactions] C[Rate of Reaction] D[Concentration of Reactants and Products] E[Closed System] F[Dynamic Nature] G[Energy Changes] A --> B A --> C A --> D A --> E A --> F A --> G B --> H{Forward Reaction} B --> I{Reverse Reaction} C --> J{Equal Rate of Forward and Reverse Reaction} D --> K{Equal Concentration of Reactants and Products} E --> L{No Loss or Gain of Matter} F --> M{Continuous Forward and Reverse Reaction} G --> N{Minimum Energy State}