Homolog vs Paralog vs Ortholog

Cited from What is the difference between orthologs, paralogs and homologs?

Homology is the blanket term, both ortho- and paralogs are homologs. So, when in doubt use "homologs". However:

• Orthologs are homologous genes that are the result of a speciation event.
• Paralogs are homologous genes that are the result of a duplication event.