The Email Capture Bot is a bot that is prebuilt to ask site visitors for their email address. Unlike the Email Capture bot skill which is placed in a conversation flow, this bot will only ask the user for their email address and respond with a thank you message once it has been submitted.
You can access the Email Capture Bot by clicking Playbooks > Create Chat Playbook > Bot/Live Chat. You will then want to select the audience for your playbook. After that step you can select Email Capture Bot on the next page.