Another common method for estimating dark energy parameters is Nested Sampling (e.g., the MultiNest algorithm): How it works: instead of a traditional chain, Nested Sampling builds a sequence of nested regions with increasing likelihood, gradually narrowing the parameter space while estimating the integral over the posterior. Advantages: works well for multimodal and high-dimensional distributions; directly provides the marginal likelihood (evidence), which is useful for model comparison. Application in cosmology: used with CMB, supernovae, and BAO data to simultaneously estimate dark energy parameters and compare different models