Now a days Lot of websites build by Joomla. The website hackers can simply hack the Joomla websites and the sites are not worked properly. How can we save Joomla websites from hackers.?.
There are hack protection extensions for joomla that will prevent your site from being hacked. Most cost money, but it is worth it to protect your site if it is big.
Joomla is just as secure as any other CMS as long as you keep the core files and extensions updated. In fact,keeping the 3rd party extensions to a minimum is better for security.
Joomla has had it's fair share of security issues - 105 in the last 6 years, see http://secunia.com/advisories/produc...ask=advisories including 6 this year alone. To their credit they do release patches/updates pretty quickly though so it pays to keep your installations up to date, including any addons.