Typescript, "people.name!" - what is meaning?

In Typescript, the exclamtion is sometimes used in last of the characters.

For example,

const people = { name: 'kim' };

if (people.name!) {
  ...
}

what is meaning?

In TypeScript, the exclamation mark (!) is used to assert that a value is not null or undefined. It is called the non-null assertion operator. However, it is typically used when you are certain that the value will not be null or undefined, and it should be used with caution.