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docs/document/Modern CSharp/docs/Parallel Programming/Overview.md

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+# Overview
+
+## Concurrency & Multi-Threading
+
+> Concurrency is about dealing with lots of things at once, but parallelism is about doing lots of things at once.
+
+- Concurrency works on a single core that handles one or more tasks at the same time with interleaving executions
+    - it's a fake parallelism, but fast enough to act like a parallelism.
+- Multi-Threading starts new threads from the same process; Threads can be handled by multiple core when available
+    - Still work concurrently when only single core available.
+    - If number of threads exceeds number of cores, the remaining are scheduled as concurrent
+
+## What's Involved
+
+- Task-based Asynchronous Model
+     - Task Creation & Invocation
+     - Task Cancellation
+     - Waiting for Task
+- Data Sharing & Synchronization
+- Thread-safe Collections
+- Task coordination
+- Paralle Utilities(`Paralle` class & PLINQ)