Yes, you can absolutely use a pick (also called a plectrum) on an acoustic guitar, and it's a common choice for many players. A pick is often used for both strumming chords and picking individual notes, depending on your playing style. Picks come in different thicknesses, which can affect your sound and playing feel. Thinner picks are typically more flexible, making them ideal for smooth, easy strumming with a softer tone. Thicker picks, on the other hand, provide more control and precision, which is particularly useful for playing lead lines or more intricate picking patterns. Choosing the right pick depends on your personal preference and the type of sound you want to achieve, so it's worth experimenting with different options to find what works best for your style.