Lightning for Gmail lets you experience Salesforce right from Gmail.
The extension is compatible with Salesforce Classic UI and Lightning Experience.
–Compatibility with the new Gmail UI is pending. Opt out of the new Gmail for the time being, to use Lightning for Gmail–
Increase productivity by getting additional information about your email with details coming from Salesforce. Create new Salesforce records without toggling between applications. Copy important emails over from Gmail to Salesforce, including attachments. Associate Google Calendar appointments to Salesforce records like an Account, Opportunity, Case, or Custom Object.
Deploy Lightning Sync on top of it, to sync Google Contacts.
Use the App Builder in Salesforce Setup to tailor content and features according to business needs.
Lightning for Gmail works with G-Suite corporate email accounts, in the Chrome browser.