Given this FastAPI code snippet, what will be the effect of the CORS middleware?

Given this FastAPI code snippet, what will be the effect of the CORS middleware?

from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware

app = FastAPI()

app.add_middleware(
    CORSMiddleware,
    allow_origins=["https://example.com"],
    allow_methods=["GET", "POST"],
    allow_headers=["*"],
)

@app.get("/")
async def root():
    return {"message": "Hello"}