What is cyber security

Computer security, cybersecurity (cyber security), or information technology security (IT security) is the protection of computer systems and networks from information disclosure, theft of, or damage to their hardware, software, or electronic data, as well as from the disruption or misdirection of the services they provide.
Cybersecurity and cyber threats have been consistently present for the last 50 years of technological change. In the 1970s and 1980s, computer security was mainly limited to academia until the conception of the Internet, where, with increased connectivity, computer viruses and network intrusions began to take off. After the spread of viruses in the 1990s, the 2000s marked the institutionalization

As per IBM,
A strong cybersecurity strategy has layers of protection to defend against cyber crime, including cyber attacks that attempt to access, change, or destroy data; extort money from users or the organization; or aim to disrupt normal business operations. Countermeasures should address:

Critical infrastructure security – Practices for protecting the computer systems, networks, and other assets that society relies upon for national security, economic health, and/or public safety. The National Institute of Standards and Technology (NIST) has created a cybersecurity framework to help organizations in this area, while the U.S. Department of Homeland Security (DHS) provides additional guidance.

Network security – Security measures for protecting a computer network from intruders, including both wired and wireless (Wi-Fi) connections.

Application security – Processes that help protect applications operating on-premises and in the cloud. Security should be built into applications at the design stage, with considerations for how data is handled, user authentication, etc.

Cloud security – Specifically, true confidential computing that encrypts cloud data at rest (in storage), in motion (as it travels to, from and within the cloud) and in use (during processing) to support customer privacy, business requirements and regulatory compliance standards.

Information security – Data protection measures, such as the General Data Protection Regulation or GDPR, that secure your most sensitive data from unauthorized access, exposure, or theft.

End-user education – Building security awareness across the organization to strengthen endpoint security. For example, users can be trained to delete suspicious email attachments, avoid using unknown USB devices, etc.

Disaster recovery/business continuity planning – Tools and procedures for responding to unplanned events, such as natural disasters, power outages, or cybersecurity incidents, with minimal disruption to key operations.

Storage security – IBM FlashSystem® delivers rock solid data resilience with numerous safeguards. This includes encryption and immutable and isolated data copies. These remain in the same pool so they can quickly be restored to support recovery, minimizing the impact of a cyber attack.

Mobile security – IBM Security® MaaS360 with Watson enables you to manage and secure your mobile workforce with app security, container app security and secure mobile mail.

cybersecurity myths As per IBM,
The volume of cybersecurity incidents is on the rise across the globe, but misconceptions continue to persist, including the notion that:

Cybercriminals are outsiders. In reality, cybersecurity breaches are often the result of malicious insiders, working for themselves or in concert with outside hackers. These insiders can be a part of well-organized groups, backed by nation-states.
Risks are well-known. In fact, the risk surface is still expanding, with thousands of new vulnerabilities being reported in old and new applications and devices. And opportunities for human error – specifically by negligent employees or contractors who unintentionally cause a data breach – keep increasing.
Attack vectors are contained. Cybercriminals are finding new attack vectors all the time – including Linux systems, operational technology (OT), Internet of Things (IoT) devices, and cloud environments.
My industry is safe. Every industry has its share of cybersecurity risks, with cyber adversaries exploiting the necessities of communication networks within almost every government and private-sector organization. For example, ransomware attacks (see below) are targeting more sectors than ever, including local governments and non-profits, and threats on supply chains, “.gov” websites, and critical infrastructure have also increased.

Source : IBM and Wikipedia