Web Development Glossary
Updated 31 May 2026 · 6 min read
This glossary defines the web development terms SMB owners meet most often, from domain and hosting to CMS, SSL, responsive design, and Core Web Vitals, in plain English so you can talk to developers with confidence.
Key takeaways
- Domain is your address; hosting is the space your site lives in.
- A CMS like WordPress lets you edit content without coding.
- Responsive design means your site adapts to phones and tablets.
- SSL (HTTPS) encrypts data and is essential for trust and SEO.
- Core Web Vitals measure real-world speed and stability.
Why does knowing these terms matter?
You do not need to code to run a website, but you do need to understand the vocabulary. Knowing what hosting, SSL, or a CMS actually means helps you compare quotes, ask the right questions, and avoid being upsold things you do not need. The definitions below are deliberately plain and practical.
- Domain
- Your website's address, like example.com, that people type into a browser. You register it for a yearly fee.
- Hosting
- The server space where your website's files live so it is available on the internet. Paid monthly or yearly.
- DNS
- The internet's address book that connects your domain name to the server hosting your site.
- CMS
- A content management system like WordPress that lets you add and edit pages without writing code.
- SSL / HTTPS
- Encryption that protects data between visitor and site, shown by a padlock. Now expected for trust and SEO.
- Responsive design
- A build approach where the layout adapts to fit phones, tablets, and desktops automatically.
- Front-end
- Everything visitors see and interact with: the design, text, buttons, and layout in the browser.
- Back-end
- The server, database, and logic behind the scenes that power features like logins and forms.
- Framework
- A foundation of pre-written code, like Next.js or React, that speeds up custom development.
- Plugin
- An add-on that extends a CMS with new features, such as contact forms or SEO tools, without custom code.
- Theme / template
- A pre-designed layout you customize, giving a faster, cheaper start than a fully custom design.
- Landing page
- A focused single page built to convert visitors for one goal, often used in ad campaigns.
- SEO
- Search engine optimization: the practice of helping your pages rank in Google and similar engines.
- Meta tags
- Hidden page info like the title and description that search engines and social platforms display.
- Sitemap
- A file listing your pages to help search engines discover and index your whole site.
- Core Web Vitals
- Google's metrics for real-world loading speed, interactivity, and visual stability of a page.
- CDN
- A content delivery network that serves your site from servers near each visitor for faster loads.
- Cache
- Stored copies of pages or files that load faster than rebuilding them on every request.
- Backup
- A saved copy of your site you can restore if something breaks, gets hacked, or is deleted.
- Staging site
- A private copy of your site where changes are tested safely before going live.
- API
- A way for two systems to talk to each other, such as connecting your site to a payment service.
- Bandwidth
- The amount of data your hosting can serve to visitors, often capped by your hosting plan.
- Uptime
- The percentage of time your site is online and reachable; good hosting targets 99.9% or higher.
- Favicon
- The small icon shown in the browser tab and bookmarks that represents your site.
- Conversion
- A desired visitor action, like submitting a form or making a purchase, that your site is built to drive.
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Frequently asked questions
What is the difference between a domain and hosting?
A domain is your address (example.com); hosting is the space where your site's files live. You need both: the domain points visitors to the hosting that serves your pages.
Do I really need SSL on my website?
Yes. SSL (the HTTPS padlock) encrypts data, builds visitor trust, and is a ranking signal for Google. It is usually free with modern hosting, so there is no reason to skip it.
What does responsive design mean?
Responsive design means your site automatically adjusts its layout to look good on phones, tablets, and desktops. With most Indian traffic on mobile, it is essential, not optional.
What is a CMS and do I need one?
A CMS like WordPress lets you edit content without coding. You need one if you plan to update pages, publish blogs, or manage products yourself rather than calling a developer each time.
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