js-const-variable

// const type variable declaration
const PI = 3.14; // Global value of pi
const TAX_RATE = 8.5; // maybe your tax rate 8.5%
const INTEREST_RATE = 12; // Bank interest rate is 12%

// output
console.log(PI); // 3.14
console.log(TAX_RATE); // 8.5
console.log(INTEREST_RATE); // 12

// If we want to make change const type variable, we get TypeError
PI = 3.1416; // TypeError

// If we want to reassign any const type variable, we get SyntaxError
const INTEREST_RATE = 15; // SyntaxError