This article goes over the differences between a visit and a session.
Session
A session is a metric that is found on Google Analytics.
A session is a group of website interactions within a given timeframe
A session ends when a user has 30 minutes of inactivity or ends at midnight
It can also end if a user arrives at one campaign, leaves, and enters the website from a different campaign
Visit
A visit is a metric found on the Platform.
A visit is a group of website interactions that starts when a user enters the website and ends when the user leaves the website
If a visitor enters the website, leaves, and enters again, it will count as a separate visit (two total)
A visit does not have an expiration time and also includes inactivity.
If a visitor enters the website and is inactive, but comes back, it will still be considered as one visit.
Multiple tabs count as multiple visits
We have backoff pinging every 10 seconds to the user to check for inactivity
The frequency will increase to up to every 5 minutes until the user becomes active again, of which it will return to checking for inactivity for every ten seconds. For example, if a user is inactive for 20 minutes, we will check their inactivity not as often as every 10 seconds due to the bandwidth
Differences
A session is based on inactivity for 30 minutes or if a user enters from a different campaign, but a visit is determined every time a user enters the website.
If a user enters your website, is active for 30 minutes, inactive for 32 minutes, active for 2 minutes, Google Analytics considers that as 2 sessions. Orbee will consider this as 1 visit.
If a user enters your website from a direct/none (source/medium) for 5 minutes, leaves for 2 minutes, and comes back in 5 minutes, Google Analytics will consider this as 1 session. Orbee will consider this as 2 visits.
You will need to understand that there will always be a discrepancy between these two metrics from Google Analytics and the Platform because of the different ways that Google and Orbee track the users' activity.