P-modes, or pressure modes, are a type of oscillation found in stars, including our Sun. These oscillations occur due to pressure changes within the star's interior, causing it to expand and contract. P-modes are primarily driven by the balance between gravity and pressure, leading to sound waves that travel through the star. These oscillations can be detected through a technique called asteroseismology, which studies the frequencies of these waves. By analyzing p-modes, scientists can gain insights into the internal structure and dynamics of stars, helping to improve our understanding of stellar evolution and behavior.