The three most common charger types for smartphones are USB-A, USB-C, and wireless. Older phones and accessories use USB-A chargers, which offer a slower charging speed. The use of USB-C chargers has become common on modern smartphones due to their faster charging and higher power delivery. Another popular choice is wireless charging, which lets you charge devices by placing them on a charging pad without a cable. These charger types serve various purposes, including compatibility, fast charging, and usability.