Looks like it's an "Asynchronous AdWords Remarketing Tag." Google has an article on it here:
https://developers.google.com/adwords-remarketing-tag/asynchronous/
See if that answers your question. 
Moz Q&A is closed.
After more than 13 years, and tens of thousands of questions, Moz Q&A closed on 12th December 2024. Whilst we’re not completely removing the content - many posts will still be possible to view - we have locked both new posts and new replies. More details here.
Best posts made by MattRoney
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RE: Www.googleadservices.com/pagead/conversion_async.js what is this url doing on my site?posted in Reporting & Analytics
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RE: Rankings Dropped After New Backlinks.posted in Link Building
Hi poke1! If Gaston's replies helped, mind marking one or more as a "Good Answer?" It'll get him some bonus MozPoints, and it's helpful for us.
Otherwise, how can we be of more help?
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RE: Good robots txt for magentoposted in Technical SEO
Hi there! Did Peter's response take care of this for you? If so, please mark it as a "Good Answer."
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RE: Home Page Ranking Instead of Service Pagesposted in Technical SEO
I have to agree on the link building suggestion. Often when I've heard folks complain about this issue it ends up being due to a dramatically stronger link profile for the home page. If you don't have relevant links pointing to the landing pages, it's quite likely the on-page optimization alone won't be enough.
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RE: JavaScript page loader - SEO impactposted in Technical SEO
Hi Luca! So sorry for the wait. Yes, Google is able to load, crawl, and index pages written in Javascript. There are mixed reports as to how well, exactly, but your research is correct.
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RE: Moz Pro: Linking RDs to Page much lower than Google Search Consoleposted in Link Explorer
Hi Jake! Just checking in—were you able to work with our Support team on this issue, or are you able to share the name of the campaign you're referring to? I want to make sure you get an answer.
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RE: Duplicate content on URL trailing slashposted in Intermediate & Advanced SEO
Hi yacpro13! Did Eric or Thomas answer your question, and if so, would you mind marking one or both responses as a "Good Answer?"
Otherwise, what questions do you still have?
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RE: Need a layman's definition/analogy of the difference between schema and structured dataposted in Intermediate & Advanced SEO
Hi Rosemary! There's actually a pretty decent explanation here: https://moz.com/learn/seo/schema-structured-data
Structured data is a system of pairing a name with a value that helps search engines categorize and index your content. Microdata is one form of structured data that works with HTML5. Schema.org is a project that provides a particular set of agreed-upon definitions for microdata tags.
Does that make sense?