#### How we confident about hypothesis after seeing evidence

Posterior describes the probability of a hypothesis given data. Posterior is a decision made after observing data, while prior is a decision based on information or experience already known before observing the data.

**Therefore, Posterior estimation is a key aspect of Machine Learning**Once we know the posterior, we can determine the label from the data.The posterior density is often intractable due to the complexity of the data likelihood. This intractability arises from the integral involved in calculating the likelihood. In essence, the posterior probability represents the updated probability of an event occurring after new evidence or information has been considered.