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We can pass record id to Visualforce page in Salesforce Lightning Record Page, using Standard Controller in the Visualforce page. We can easily get record Id in a Visualforce page used in Lightning Record Page using Standard Controller. Blog Post: https://www.infallibletechie.com/2022/09/how-to-pass-record-id-to-visualforce-page-in-salesforce-lightning-record-page.html