The document discusses web development topics including: - HTTP is the protocol for requesting and transmitting web pages and web APIs use HTTP verbs like GET and POST. - Asynchronous JavaScript and XML (AJAX) allows dynamic web page updates by making HTTP requests in the background. - The same-origin policy prevents JavaScript from making requests across domains for security reasons. Cross-origin resource sharing (CORS) and JSON with padding (JSONP) work around this limitation. - Common HTTP verbs include GET (retrieve data), POST (submit/save data), PUT/PATCH (update data), and DELETE (remove data).