To understand how many users are coming from various devices, like computers or mobile phones, you run a report that shows this data, per device, over the past 30 days.
In this report, which of these is considered a “metric” in Google Analytics?
Explanation:
Metrics are quantitative measurements. The metric Sessions is the total number of sessions. The metric Pages/Session is the average number of pages viewed per session.
user metrics are calculated in two basic ways:
As overview totals
where the metric is displayed as a summary statistic for your entire site, such as bounce rate or total pageviews.
In association with one or more reporting dimensions
where the metric value is qualified by selected dimension(s).
Read more here: https://support.google.com/analytics/answer/1033861