This is not the text on the webpage. This is for search engines and often appears on search engine results pages and social media (see screenshots below).
When you enter "summaries" in the ESCWA system, they are coded as what is commonly known as "descriptions" for search engine purposes.
Summaries (description) help search engines understad what the page is about and will often put the description in the search results (see screenshot below)
Descriptions help people decide whether the information on the page is what they are looking for when they are scanning search results
Summaries (description) appear in Facebook posts (otherwise, it may pull from other sources or leave blank)