Here’s the link to the official documentation:
…and here are the definitions of ‘deprecated’ and ‘discontinued’:
A deprecated feature will be discontinued from the product in a future release, but is still supported and included in the current release to maintain backward compatibility. It’s recommended you discontinue using deprecated features in new and existing projects to maintain compatibility with future releases.
A discontinued feature was deprecated in an earlier release. It may continue to be included in the current release, but is no longer supported. Discontinued features may be removed entirely in a future release or update.
Read on for the lists of deprecated and discontinued features.