A web skimmer is usually a piece of malicious JavaScript (JS) code embedded in web payment pages to perform skimming. Such malware arrives on target pages via a compromised third-party script service. Web skimmers were designed to retrieve customer payment information. Magecart is a group known to use web skimmers. For more information, see this blog post on how you can protect yourself from Magecart and other e-commerce attacks. Synonym(s): digital skimmer