What are viruses designed to do on a computer?

Viruses are designed to secretly attach themselves to legitimate host programs in order to execute malicious actions that can potentially harm data and disrupt system functionality. When a virus infiltrates a computer, it can replicate itself and spread to other systems, causing damage by deleting files, corrupting data, or stealing sensitive information. This hidden nature is key to their operation, as they often go unnoticed by users until they manifest in harmful ways, such as significant data loss or system crashes. Understanding this aspect of viruses emphasizes the importance of cybersecurity measures to protect against such threats. The other options do not align with the fundamental purpose of viruses, which is primarily focused on causing harm rather than providing benefits such as speed, organization, or enhanced connectivity.