In short, smart segments are dynamic and constantly updated to meet the assigned condition(s) while standard segments are static.
Smart Segments...
Are created by assigning conditions that are evaluated against your data.
Are used when you'd like a list that automatically refreshes to only include contacts that meet the criteria.
Have the option to add qualifiers (additional filters).
Are able to have more than one condition.
*Note: When there are two or more conditions, the selected conditions become an "and" statement (i.e. a list of contacts for customers who have attended your studio three or more times in the last 30 days AND have a membership).
Standard Segments...
Are created by manually uploading a CSV file or adding individual contacts.
Are used when you already have an existing list in your previous email platform or in the rare instance when our conditions cannot capture the intended data.