When recording sound electronically, there will likely be noise, analogue distortion, and digital distortion present. Recordings can be mono (using one microphone or speaker) or stereo (using multiple microphones or speakers). Sound is recorded digitally using file formats like .mp3, .wav, etc. Analogue sound provides stronger signals but digital sound offers more reliability and flexibility when connecting to other digital devices or media. Interactive media like CDs, DVDs, television, and mobile phones use sound recordings for entertainment purposes and to convey emotions or provide alerts and notifications.