WordPress 3.6 introduced the “Heartbeat API”. This API is used internally by WordPress to keep track of logged in users and their active sessions. If you’ve ever been asked to log into WordPress while navigating the admin panel, then you’ve already experienced the API at work.
The API uses Javascript
Squarespace and WordPress are two of the most popular Content Management Systems. Each has its own share of merits and demerits, and each serves different usages. While Squarespace is an entirely hosted and managed platform, WordPress is a self-hosted software that you can run and manage yourself
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