What is the purpose of a Secure Digital (SD) Card?

The purpose of a Secure Digital (SD) Card is fundamentally to provide non-volatile memory for portable devices. Non-volatile memory refers to storage that retains data even when the device is powered off, making SD cards particularly valuable for storing files such as photos, music, videos, and applications on devices like cameras, smartphones, and tablets.

SD cards are designed to be compact and portable, facilitating easy transfer of data between devices. This versatility allows users to expand the storage capacity of their devices without relying solely on internal memory. SD cards come in various capacities and speed classes, enabling them to cater to different storage needs and performance requirements for various applications.

The other options focus on different functions that do not align with the primary purpose of an SD card. For instance, facilitating Wi-Fi connections relates to networking capabilities rather than storage. Encrypting data in transit pertains to securing data being transferred, which is not a function of SD cards, since they store data rather than transmit it. Enhancing software performance could involve RAM or processor capabilities but does not pertain to the storage functions of an SD card.