Antimicrobial agents are substances that help fight against harmful microorganisms, such as bacteria, viruses, fungi, and parasites. They can be found in various forms, including medications like antibiotics and antifungals, which are used to treat infections. By targeting specific processes in these microorganisms, antimicrobial agents can either kill them or inhibit their growth, helping the body to recover from illness. These agents play a crucial role in modern medicine, making surgeries safer and treating diseases more effectively. However, the overuse of antimicrobial agents can lead to resistance, where microorganisms evolve and become harder to treat. This is why it's important to use them responsibly and only when necessary.