Vernacular, which is no new term in contemporary discourse , means language

In fact, the Indian press has its roots in vernacular newspapers which run till day to cater to the majority of the grassroots population which is mainly Hindi speaking. Hence, it can be established that local dilaect holds umpteen importance for any campaign or cause in the country. And when one talks about campaigns and cause, the rapid emergence and impact of internet, digital platforms cannot be avoided.

https://thecomingyearsblog.wordpress.com/2020/04/16/narrowing-digital-divide-makes-room-for-vernacular-apps-but-there-is-a-catch