https://pceasyblog.org/why-avast-antivirus-is-totally-worth-downloading

Many people are unaware of the many issues the industry faces. Even the top antivirus products can be affected by issues. While some issues are minor and can be dealt with easily, others are more serious.

One of the biggest problems is that the virus-signature protection doesn’t cover a broad range of threats. It takes antivirus companies several months to release antivirus updates after new viruses are discovered. This is because they need to wait until their products recognize the virus and send the virus to be examined.

In the meantime the virus is likely to spread and it’s likely that dozens or even hundreds of computers will be affected by the virus. It may also be spread to other networks. To be efficient, anti-virus software has to be able to identify and eliminate these infections quickly. This means that behavior blocking or heuristic analysis tools are more effective than simple signature detection.

Incompatibility is a different issue. While the majority antivirus software developers place an emphasis on developing quality products and pay tremendous attention to fixing bugs, the truth is that sometimes, multiple antivirus programs can lead to conflicts.