Haplotypes are combinations of alleles inherited together on a chromosome. Traditional short-read sequencing methods can identify genotypes but often fail to capture detailed haplotype information, such as allele colocalization or parental origin. Third-generation sequencing technologies, including long-read and long-range methods, offer higher resolution, enabling more accurate haplotype reconstruction in diploid, polyploid, and metagenomic contexts. To achieve this, advanced computational strategies are needed to reconstruct haplotypes from sequencing data. This chapter explores the evolution of sequencing and computational approaches for integrating various sequencing methods to produce chromosome-scale haplotypes, while addressing the challenges and prospects for scaling haplotype analysis across species. Comprehensive haplotype analysis has great potential for enhancing our understanding of complex genetic variations and their roles in diseases.