Open Email - An email was sent to this lead and the transparent 1x1 tracking image was downloaded by an email client (may or may not have been the actual lead, the person could have forwarded it to someone else without opening).
Click Email - An email was sent to this lead with at least one link in it and at least one link was clicked.
Click Link - Specific link was clicked
View Web Page - A cookied lead visited a webpage with Munchkin tracking code on it
Hard Bounce & Soft Bounce - See Hard and Soft Bounces in Email - Marketo Docs - Product Docs
Fill Out Form - A lead filled out a Marketo form and submitted it.
Unsubscribe Email - A lead clicked a link in an email leading to a webpage containing a Marketo form where the lead submitted the form causing the "Unsubscribed" field to be changed to "True"
Send Email - A lead was qualified to receive a specific email being sent out of Marketo (note: does not mean the actual email was sent at this exact time).
Email Delivered - A lead was delivered the email (note: it is possible for a lead to be delivered an email, then have this revoked. It is not a guarantee it will 100% make the lead's inbox. see this Why Does My Smart List Count Not Match the Email Performance Report? ).
Click To Open - Clickthrough rate is defined as "times at least one click occurred on any link in an email / # delivered" Click To Open is defined as "times at least one click occurred on any link in an email / # opened"
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