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C# is a modern, object-oriented programming language developed by Microsoft. It is useful, type-safe and relatively easy to learn compared to languages like C++.

Designed for building Windows applications, web services and games
Used by millions of developers worldwide
Similar syntax to Java and C++
Runs on the .NET framework

Why Does Unity Use C#?

Beginner-friendly: Clean syntax with less complex memory management than C++.
Performance: Faster than interpreted languages like Python or JavaScript.
Garbage collection: Automatic memory management.
Object-oriented: Perfect fit for Unity's GameObject-Component model.
Large ecosystem: Thousands of libraries and learning resources.

What Makes C# in Unity Different?

C# in Unity is the same language as standard C#, but Unity provides additional classes and methods specifically for game development.

Standard C#	Unity C#
Console applications	Game scripts attached to GameObjects
Console.WriteLine()	Debug.Log()
System.Timer	Time.deltaTime
Manual game loop	Update(), FixedUpdate(), LateUpdate()
No built-in input handling	Input.GetKey(), Input.GetMouseButton()

What Can You Do with C# in Unity?

Control GameObjects (move, rotate, scale, enable, disable)
Handle player input (keyboard, mouse, touch)
Manage game state (score, health, levels)
Spawn objects (enemies, bullets, power-ups)
Respond to collisions and triggers
Control UI (text, buttons, menus)
Implement enemy AI (chase, patrol, attack)
Play sounds and visual effects

How Scripts Work in Unity

A script is a Component. Just like a Transform or Rigidbody, you attach it to a GameObject.

Basic workflow:

Create a C# script in the Project window.
Write code inside the script.

C-sharp-script-in-unity — C-Sharp Script in Unity

Drag the script onto a GameObject in the scene.
Press Play – the code runs automatically.

Script-attached-to-Gameobject-as-component- — Scripts are attached to GameObjects as components

Structure of a Unity Script

using UnityEngine;
public class ScriptName : MonoBehaviour
{// Variables (data)
    public int score = 0;
    private float health = 100f;
    // Methods (behavior)
    void Start()
    {
        // Runs once at beginning
    }
    void Update()
    {
        // Runs every frame
    }
}

Every Unity script needs:

using UnityEngine; – Access to Unity engine features
: MonoBehaviour – Inherit Unity event methods
A name that matches the file name

Public vs Private in Unity Scripts

public int health = 100;        // Visible and editable in Inspector
private int score = 0;          // Hidden in Inspector
[SerializeField] private int lives = 3;  // Visible but still private

public: Shows in Inspector, accessible by other scripts
private: Hidden in Inspector, only accessible within this script
[SerializeField]: Private but visible in Inspector (best practice)

Introduction to C# in Unity