Generally this is when advertisers track your movements. The goal is to make a profile of you (interests, age, gender, wealth etc). With this information they can better target ads that might interest you. A good example is the Amazon.com homepage. It changes a lot based on what you look at on the site.
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Profiling is the process of executing a correct program on different data sets to measure the time and space that is takes to compute the results.
DNA profiling
Profiling
"XS" typically stands for "extra small," a clothing size designation that indicates a smaller fit compared to standard sizes. It is often used in fashion and apparel to cater to individuals who require smaller garments. Additionally, "xs" can also refer to "cross-site," as in cross-site scripting (XSS) in web development, but in the context of sizing, it predominantly means extra small.
Both off-site and off site are correct in different circumstances. E.g. "I am taking the car off site." "Fred's not here because he's an off-site worker"