These are ready-to-use lists. You can use them for targeted lead generation and marketing activities. Check them out here.
All emails are validated (it prevents bounces).
You have 2 options for each list type -
Buy list with business emails
Buy list with business emails + common connections (mutual contacts you have with the people in the list - so you can request introduction and increase success rate by 40% as compared to cold calls)
Apart from the above, all the email lists provide the following information -
Phone (if available)
Email us at firstname.lastname@example.org if you have questions, or if you'd like to submit request for a custom list.