========
Concepts
========

There are common concepts used throughout Telemetry:

* :doc:`pings <pings>` - the packets we use to submit data
* :doc:`sessions & subsessions <sessions>` - how we slice a users' time in the browser
* *measurements* - how we :doc:`collect data <../collection/index>`
* *opt-in* & *opt-out* - the different sets of data we collect
* :doc:`submission <submission>` - how we send data to the servers
* :doc:`archiving <archiving>` - retaining ping data locally
* :doc:`crashes <crashes>` - the different data crashes generate

.. toctree::
   :maxdepth: 2
   :titlesonly:
   :glob:
   :hidden:

   pings
   crashes
   *
