The Student's t-Distribution is a probability distribution used in statistics, particularly when dealing with small sample sizes. It is similar to the normal distribution but has heavier tails, which means it accounts for the increased variability that can occur with smaller samples. This makes it useful for estimating population parameters when the sample size is limited. The t-distribution is commonly applied in hypothesis testing and constructing confidence intervals, especially when the population standard deviation is unknown. As the sample size increases, the t-distribution approaches the normal distribution, making it a versatile tool in statistical analysis.