The volume of internet transactions has multiplied dramatically in recent years. The internet, however, has numerous security flaws. As a result, protecting our sensitive data is currently a very difficult task. The majority of medium and big businesses having an online presence are linked to a network. Security demands that a barrier be built between the internal network and the public Internet. The "trusted" and "untrusted" sides of the network can be used to describe them. There are numerous tools and gadgets available to assist safeguard our data. By enrolling in the top cyber security certification programmes, anyone can learn more about these concepts. For instance, a firewall safeguards our data and deters illegal access.