Let me explain singleton in super easy terms:

💡 Imagine a coffee machine at the office

• If everyone uses the same coffee machine — that’s a singleton.
• If every person gets their own coffee machine — that’s not a singleton.

💻 In code:

A singleton means:

"Spring will only create one single instance of this class and reuse it everywhere."

✅ Why it’s good:

• Saves memory.
• Keeps shared state consistent.
• You don’t want to keep creating the same object over and over.

🧠 What Spring does:

When you mark a class with @Component, @Service, or @Bean (inside @Configuration):

java
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@Component
public class MyService {
    // Spring creates only ONE of this
}

Spring will:

• Create 1 instance.