Inspection of tickets — the act of checking tickets (often expressed as 改札する).
改札で切符を見せてください。
Please show your ticket at the ticket inspection (gate).
駅員が改札をして乗客の身分を確認した。
A station staff member checked tickets and verified passengers' identities.
イベント会場で入場券の改札が行われた。
Ticket checks were carried out at the event venue.
Ticket gate; the entrance/exit area at a station where tickets are checked (often used as an abbreviation for 改札口).
改札を出るとすぐコンビニがあります。
There is a convenience store right after you exit the ticket gate.
改札口で待ち合わせしましょう。
Let's meet at the ticket gate.
自動改札が故障して、駅員が対応していた。
The automatic ticket gate malfunctioned and a station employee was dealing with it.