Alexa is a competitor intelligence and website analytics software that provides actionable SEO insights based on a sample of data from the web. Alexa enables users to view audience demographics, engagement, traffic trends, keyword research, traffic sources, and website comparisons.
Gmail is a free, advertising-supported email service offered as part of Google's G Suite, with 15GB of storage, color-coded inbox filters and unsend button.
Hypertext Markup Language (HTML) is the standard markup language for documents designed to be displayed in a web browser. It can be assisted by technologies such as Cascading Style Sheets (CSS) and scripting languages such as JavaScript.