RLSA stands for Remarketing Lists for Search Ads. This is a Google advertising product that allows advertisers to target their ads at people who have already visited their website, when they search on Google. To use RLSAs, advertisers need to create a remarketing list in Google AdWords and add a remarketing tag to their website. When a user visits the website, they will activate the tag and be added to the remarketing list. When they search on Google later, they will then be targeted with the ads. RLSAs are customisable, so advertisers can set different bids for these people, for example, or target them with different ads.