The terms “online” and “offline” (also stylized as “on-line” and “off-line”) have specific meanings in regard to computer technology and telecommunications. In general, “online” indicates a state of connectivity, while “offline” indicates a disconnected state. The concepts have however been extended from their computing and telecommunication meanings into the area of human interaction and conversation, such that even offline can be used in contrast to the common usage of online.
Since the COVID 19 pandemic “online” is being used for meetings performed on the internet, and “offline” is used for onsite, in person meetings, like in the good old days. There is a new word “hybrid” which is used when some of the participants join the meeting via internet and the others go to a conference center or a hotel.