Great for

• Use pre-built templates to build emails
• MailChimp also has features to enable remarketing on Google, Facebook and Instagram
• Advanced reporting features that combine email and website data from Google Analytics so you can see the whole picture
• Create A/B and Multivariate tests for your emails
• Create landing pages for your website with MailChimp
• Download the MailChimp app for access on the go
• Integrate with a wide range of 3rd party tools
• Create advanced email campaigns for users who abandon their shopping cart

Be aware that

• The free account tier is limited to 2,000 subscribers or 12,000 emails per month