Stellar outbursts refer to sudden and dramatic increases in the brightness of a star. These outbursts can be caused by a variety of factors, including changes in the star's internal structure, interactions with a companion star, or the accretion of material from a surrounding cloud of gas and dust. One common type of stellar outburst is a nova, which occurs when a white dwarf star in a binary system accretes material from its companion star, leading to a sudden increase in brightness. Another type of outburst is a supernova, which occurs when a massive star reaches the end of its life cycle and undergoes a catastrophic explosion. Stellar outbursts are important for astronomers to study because they provide insights into the processes that govern stellar evolution and the properties of stars. By studying these outbursts, scientists can learn more about the lifecycle of stars, the mechanisms that drive their variability, and the impact of these events on their surrounding environments.