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Website upgrades & Maintenance
Like all software a website's programming needs constant upgrades and maintenance in order to keep it running as smoothly as possible. Not to mention as securely as is possible.
Wordpress in particular is a piece of software they gets very vulnerable to attack is it gets out of date, this is owing primarily to it's massive popularity - which makes it an appealing target for hackers. A victum of it's own success in a way.