Complexity
The study of how intricate, difficult, or resource‑intensive a system or problem is.
Algorithmic Complexity
Measures the amount of computational resources (time, space) required by an algorithm as a function of input size. Common classifications include Big O notation such as O(n), O(log n), O(n²), etc.
System Complexity
Describes the interconnections, dependencies, and emergent behavior within a system. Factors include component diversity, interaction patterns, and adaptability.
Computational Complexity Theory
A branch of theoretical computer science that classifies problems based on the resources needed for their solution. It defines complexity classes like P, NP, PSPACE, and EXP.
Practical Implications
Understanding complexity helps in optimizing code, designing scalable architectures, and assessing feasibility of algorithms in real‑world applications.