What is war chalking?

War chalking refers to the practice of marking pavement with symbols or codes to indicate the presence and availability of wireless network access, specifically Wi-Fi. This method emerged as a way for individuals to share information about where free or accessible wireless internet can be found in public spaces. The symbols can communicate various details, such as the strength of the signal, whether the network is open or secured, and other pertinent information for potential users.

In this context, option B accurately encapsulates the essence of war chalking—it's about tagging locations to facilitate ease of access to wireless networks. This practice has its roots in earlier traditions like "war driving," where individuals would drive around in vehicles to discover and map out wireless networks, often by using computers or smartphones. The use of physical symbols on pavement adds a layer of community sharing and awareness about internet access points in a given area.