Two separate systems
A Content ID claim happens automatically. YouTube's system found part of your video matching a reference file supplied by a rights holder. A copyright strike comes after a formal takedown request, in which a rights holder asks YouTube to take your video down.
What a claim does
A claim is not a penalty against your channel. Depending on the rights holder's policy, the video may earn money for them, be blocked in certain countries or just be tracked. Your channel's standing stays the same.
What a strike does
A strike takes the video down and restricts some features for a while. Three active strikes within 90 days can get the channel terminated. Strikes expire after 90 days provided you finish Copyright School and receive no further strikes.
How to react
- When it is a claim: if the material is yours or you hold a license, dispute the claim in YouTube Studio with a clear explanation. If not, you can cut or replace the matched section.
- When it is a strike: let it expire, ask the claimant to withdraw it, or file a counter-notification if you believe the removal was wrong or your use is allowed.
A counter-notification is a legal procedure and reveals your contact details to the claimant, so only use it when you are sure. Creators in a network can ask the network to review the case first.