Depending on your interest, this topic generally points to one of the following:

If you are looking for general information on what a "Dub" refers to in this context:

Titled "Showdown at the Po-ke Corral". This episode follows Ash returning to Pallet Town to prepare for the Indigo League.

It allows viewers to understand the dialogue in their native language without needing to read subtitles.

DUB IN LIFE Everyone, is looking for the dub in this life. Everybody, just keep on asking why why why. What is dub in this life. YouTube·Bliss Corporation 'Dragon Ball Super' Dub Episode 65 Recap With Spoilers

Titled "Final Judgment? The Ultimate Power of an Absolute God". This episode is a major turning point featuring the fusion of Zamasu and Goku Black.

A song by the Italian group Eiffel 65 from their album Europop . Quick Guide to "Dubs" in Media

For a musical perspective, you can listen to Eiffel 65's track here: Eiffel 65 - Dub In Life Bliss Corporation YouTube• Dec 4, 2009