Kaspersky

Kaspersky is a good anti-virus. You can block also ffrom this anti-virus. You can use it for one month before purchasing it

DNS

DNS server change domain name into ip address. All dns server are connected to each other. So that when you purchase a domain name then it is updated every-where in this world

What Is Ajax

Ajax is a programming language used for making dynamic pages. It was popular when google use it in search results. It helps in saving time and money