Rust: What is the difference between struct and enum in Rust?

Struct — custom type with fields. Enum — type with variants.

Struct:

• Custom data structure.
• Named fields.
• Multiple types.
• Like class without methods.

1struct Person {
2    name: String,
3    age: u32,
4}
5
6let person = Person {
7    name: String::from("John"),
8    age: 30,
9};

Enum:

• Multiple variants.
• Can hold data.
• Algebraic data types.
• Pattern matching.

1enum Shape {
2    Circle(f64),
3    Rectangle(f64, f64),
4    Square(f64),
5}

Key differences:

• Struct — one shape.
• Enum — multiple variants.
• Struct — fixed structure.
• Enum — flexible variants.