In Go, type and interface are related but serve different purposes. Let’s break it down:

1️⃣ type

• Purpose: Used to define a new type or create an alias for an existing type.
• Can define:
  • Basic types (int, float64, etc.)
  • Structs
  • Interfaces
  • Function types

Examples:

New basic type:

type MyInt int

Struct type:

type Person struct {
    Name string
    Age  int
}

Function type:

type Adder func(a, b int) int

Interface type:

type Speaker interface {
    Speak() string
}

Notice that interface itself is defined via type.

2️⃣ interface

• Purpose: Defines a set of method signatures.
• Any type that implements all those methods satisfies the interface.
• Interfaces are used for polymorphism and abstraction in Go.