Wireless eavesdropping captures Wi-Fi frames — trivial on open networks, possible on WPA2-PSK if handshake is captured and PSK cracked, prevented by WPA2/3-Enterprise (unique per-user keys).
WPA2-Personal: if PSK is cracked after capturing 4-way handshake, ALL past traffic can be decrypted. WPA2/3-Enterprise: unique per-session keys — even with user credentials, other users' traffic can't be decrypted. Always use VPN even on corporate Wi-Fi for truly sensitive communications.