By means of electronics, or of electronic technology.
"The door lock can be opened electronically using a key fob rather than a physical key."
In plain English: Electronically means doing something using computers, phones, or other digital devices instead of writing it down on paper.
"I sent him an invitation electronically so he would receive it instantly on his phone."
Usage: Use this adverb to describe actions performed via digital devices or computer networks rather than by hand. It is the standard modifier when referring to communication sent through email or data transmitted over the internet.
The word electronically is formed by adding the suffix -ally to electronic. It entered English as a straightforward derivative to describe actions performed via electronic means.