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Shared vs. VPS (advantages/disadvantages)
Shared hosting is a service where hosting provider sells accounts on one server where can multiply websites be hosted.
It is a very popular way of hosting the website, as it can be quite cheap and useful for small websites not spending alot of resources.
The main disadvantage of the shared hosting is that you are basily living in the same enviroment as other websites.
That can put a question of theoretical risk for your data security, for your emails going through (You all are sending it from one ip address, if one is spamming, all are considered spammers), resource measurment, etc...