What do clicks in /1/stats/accounts/:accountId response stand for?

ads
analytics
api

#1

Documentation: https://dev.twitter.com/ads/reference/1/get/stats/accounts/%3Aaccount_id

I’m confused on what different clicks stand for in response to the above when using ORGANIC_TWEET entity.

This is sample response:

{"data_type":"stats","time_series_length":1,"data":[{"id":"11111111111111111","id_data":[{"segment":null,"metrics":{"impressions":[13],"qualified_impressions":null,"follows":null,"app_clicks":null,"retweets":[2],"likes":null,"engagements":[3],"clicks":[1],"card_engagements":null,"replies":null,"url_clicks":null,"carousel_swipes":null}}]}],"request":{"params":{"start_time":"2016-05-30T16:00:00Z","segmentation_type":null,"entity_ids":[737313523202699264],"end_time":"2016-05-30T17:00:00Z","country":null,"placement":"ALL_ON_TWITTER","granularity":"HOUR","entity":"ORGANIC_TWEET","platform":null,"metric_groups":["ENGAGEMENT"]}}}

What are clicks, url_clicks and app_clicks? I can’t find definitive definition in analytics documentation and the resulting data for those numbers doesn’t line up with the data in ads.twitter.com.