A loader is a type of malicious software designed to infiltrate a computer system and install or execute additional malware. Unlike standalone viruses or worms, loaders typically act as a delivery mechanism, allowing cybercriminals to deploy various types of harmful programs such as ransomware, spyware, or trojans. Loaders often enter systems through phishing emails, malicious attachments, or compromised websites. Once active, they connect to remote servers to download and launch further malicious payloads, making them a key tool in many cyberattacks. Their primary purpose is to ensure that other, more damaging malware can bypass security defenses and infect the target system.