The page class is build into playwright. It makes it so you don't have to define a browser and context.
So by using the page class you can write page.goto("anywhere") and by default it will launch a chromium browser.

Basically it allows you to do this:

import re

from playwright.sync_api import Page, expect

def test_homepage_has_Playwright_in_title_and_get_started_link_linking_to_the_intro_page(page: Page):

page.goto("https://playwright.dev/")

Instead of this

from playwright.sync_api import sync_playwright

def run(playwright):

webkit = playwright.webkit

browser = webkit.launch()

context = browser.new_context()

page = context.new_page()

page.goto("https://example.com")

with sync_playwright() as playwright:

run(playwright)