Web hosting is necessary in order to make a website accessible to the public via the Internet. Without web hosting, a website's files would not be stored on a server that is connected to the Internet, and therefore would not be able to be accessed by users.

System administration is necessary in order to ensure that the servers and systems that host a website are running smoothly and efficiently. It helps to prevent downtime and keep the website accessible to users. It also helps to ensure that the website's software is up-to-date, which can prevent security vulnerabilities from being exploited. Additionally, system administrators are responsible for monitoring the website's security and taking steps to prevent unauthorized access or data breaches.

In summary, web hosting provides the necessary infrastructure to host a website and make it available to the public while system administration ensures the smooth and secure operation of the website.

Web hosting and system administration services can help small businesses grow in a number of ways:

1. Increased online presence: By having a website that is easily accessible to the public, a small business can reach a larger audience and increase their online presence. This can lead to more customers and increased sales.

2. Improved reliability: By using web hosting and system administration services, a small business can ensure that their website is reliable and available to customers at all times. This can lead to increased customer satisfaction and loyalty.

3. Better security: By using web hosting and system administration services, a small business can ensure that their website is secure and that customer data is protected. This can lead to increased customer trust and confidence in the business.

4. Scalability: By using web hosting and system administration services, a small business can ensure that their website can handle an increase in traffic as the business grows. This can help to prevent downtime or other issues that can occur as a result of a sudden increase in traffic.

5. Professionalism: Having a professional website, that is well-maintained, well-designed, and runs smoothly can give a good impression to customers and help to build trust and confidence in the business.

Overall, by using web hosting and system administration services, small businesses can improve their online presence, reliability, security, scalability and professionalism which are all key factors that can help to drive growth.