Formerly Better WP Security, iThemes is the #1 security plugin giving you over 30+ ways to secure and protect your WordPress site. On average, 30,000 new websites are hacked each day. WordPress sites can be an easy target for attacks because of plugin vulnerabilities, weak passwords and obsolete software.
Most WordPress admins don’t know they’re vulnerable, but iThemes Security Pro works to lock down WordPress, fix common holes, stop automated attacks and strengthen user credentials.
If your site is with a budget shared hosting provider then you really need this plugin. If you have a quality managed host, then chances are higher that you could get away without it. Having said that; if in doubt, more security is better than less. I have a great managed host and I still use it.
With WordPress powering 35% of the internet the platform has a massive target on its back. Both features and support make iThemes Security Pro the best plugin to harden WordPress.