An "antiviral" refers to a type of medication or treatment designed to combat viral infections. Unlike antibiotics, which target bacteria, antivirals specifically work against viruses, such as the ones that cause the flu or HIV. They can help reduce the severity and duration of an illness by inhibiting the virus's ability to replicate and spread within the body. These medications can be taken in various forms, including pills, injections, or topical treatments. Some common examples of antivirals include oseltamivir for the flu and acyclovir for herpes. By targeting the virus directly, antivirals play a crucial role in managing viral diseases and improving patient outcomes.