I was wondering how a website is able to notify a person in email about something if you sign up to get notified from that site. I mean for instance some sites will let you get notified each time a person posts something on the site such as AMHD, other sites you can subscribe to something and they will send you an email daily or weekly, etc. I mean does a human have to send all the email notifications to people or is it an automated type of system that sends out hundreds and thousands of emails to people.
If you order something online how does the website the company has notify them when someone ordered something from them.
Is the following true.
I heard that if you see a lock and key on the website you know the site is secure. I also heard that when you order something that the info you share for the order is encrypted. If that is the case than how is the info encrypted and if it is does the company really know for instance a persons credit card number.
Is it hard for a person to create a website so others can go to it.