Web Hosting Glossary: 25 Terms Every Business Owner Should Know
Updated 31 May 2026 · 6 min read
This glossary defines the 25 hosting terms business owners meet most: domain, DNS, bandwidth, SSL, uptime, CDN, VPS, and more, each in one or two plain sentences so you can read a hosting plan with confidence.
Key takeaways
- Domain is your address; hosting is the building that stores your site.
- Uptime measures reliability; aim for a 99.9%+ guarantee.
- SSL adds the padlock and https that customers and Google expect.
- Bandwidth and storage are the two limits most plans advertise.
- A CDN speeds up your site for visitors far from your server.
How to use this glossary
Hosting plans are full of jargon that can make a simple decision feel complicated. This glossary translates the most common terms into plain English so you can compare plans and talk to providers without getting lost. You do not need to memorise everything; skim it, then return when a term appears on a plan you are considering. The definitions focus on what each word means for your business, not deep technical detail. Once these click, hosting comparison shopping becomes far easier.
- Domain name
- Your website's address, like yourbusiness.in, that people type to reach you. You rent it yearly from a registrar.
- Web hosting
- The service that stores your website's files on an always-on server so visitors can access your site any time.
- Server
- A powerful computer kept running 24/7 in a data centre that delivers your website to visitors' browsers.
- Shared hosting
- A budget plan where many websites share one server and split its resources and cost. Best for small sites.
- VPS
- Virtual Private Server, a reserved, isolated slice of a server giving you more power and full control than shared hosting.
- Cloud hosting
- Hosting spread across many servers so your site scales on demand and stays up even if one server fails.
- Bandwidth
- The amount of data your site can transfer to visitors in a period. Heavy traffic or large files use more.
- Storage / disk space
- How much room you get for your site's files, images, and database. SSD/NVMe storage is faster than older HDD.
- Uptime
- The percentage of time your site stays online. A 99.9% guarantee means under about nine hours of downtime a year.
- Downtime
- Any period when your website is unreachable, which costs you visitors, sales, and trust.
- SSL certificate
- A small file that encrypts data and enables https plus the browser padlock. Often free with hosting.
- DNS
- The Domain Name System, the internet's address book that connects your domain name to your server's IP address.
- TTL
- Time To Live, how long DNS records stay cached. Lowering it before a migration speeds up the switch.
- Nameservers
- The DNS servers that hold your domain's records. Pointing them to a host directs your domain to that host.
- CDN
- Content Delivery Network, a network of servers worldwide that cache your site closer to visitors for faster loading.
- cPanel
- A popular control-panel dashboard for managing hosting: files, email, databases, and domains in one place.
- Managed hosting
- A plan where the provider handles updates, security, backups, and optimisation for you, at a higher price.
- Backup
- A saved copy of your site you can restore if something breaks or gets hacked. Daily automated backups are ideal.
- Staging site
- A private copy of your live site where you test changes safely before publishing them to the public.
- Migration
- The process of moving a website from one host or server to another, ideally with zero downtime.
- Data centre
- The secure, climate-controlled facility where hosting servers physically live. Location affects speed for your visitors.
- IP address
- A numeric label, like 192.0.2.1, that identifies your server on the internet. DNS maps your domain to it.
- Caching
- Storing ready-made copies of pages so they load faster, reducing work for the server on repeat visits.
- PHP
- The programming language WordPress and many sites run on. Newer PHP versions are faster and more secure.
- Renewal price
- The standard rate you pay after a discounted intro term ends, often 2-4x higher. Always check it before buying.
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Frequently asked questions
What is the difference between a domain and hosting?
The domain is your address that people type, and hosting is the storage where your site actually lives. You need both; a domain alone shows nothing, and hosting without a domain has no public address.
What does 99.9% uptime really mean?
It means your site is guaranteed online 99.9% of the time, allowing roughly nine hours of downtime per year. Higher guarantees like 99.99% allow under an hour, which matters for stores and busy sites.
Do I need a CDN?
If your visitors are spread across regions or countries, a CDN noticeably speeds up loading by serving cached copies from nearby servers. For a purely local, low-traffic site it is helpful but not essential.
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