Glossary
- Domains and Registration
- DNS and Records
- Email and Deliverability
- SSL/TLS and Security
- Hosting and Infrastructure
- SEO and Search Optimization
Domains and Registration
- Domain Name
- Top-Level Domain (TLD)
- gTLD
- ccTLD
- sTLD (Sponsored TLD)
- Brand TLD (.BRAND)
- IDN Domain
- Punycode
- Second-Level Domain (SLD)
- Third-Level Domain
- Subdomain
- Apex Domain
- FQDN
- Hostname
- Registrar
- Registry
- Registrant
- Administrative Contact
- Technical Contact
- Billing Contact
- WHOIS
- RDAP
- WHOIS Privacy / Domain Privacy
- Redacted WHOIS
- EPP
- EPP Code / AuthInfo
- Domain Lock / Registrar Lock
- Registry Lock
- Domain Transfer
- Incoming Transfer
- Outgoing Transfer
- Push / Internal Transfer
- Change of Registrant
- Domain Renewal
- Auto-Renew
- Grace Period
- Add Grace Period
- Renewal Grace Period
- Redemption Period
- RGP (Redemption Grace Period)
- Pending Delete
- Domain Expiration
- Expiry Date
- Creation Date
- EPP Status Codes
- clientTransferProhibited
- clientUpdateProhibited
- clientDeleteProhibited
- clientRenewProhibited
- serverTransferProhibited
- Domain Parking
- Domain Forwarding
- URL Forwarding
- Masked Forwarding
- Email Forwarding
- Domain Alias
- Site Mirror
- Canonical Domain
- Premium Domain
- Reserved Name
- Blocked Name
- Sunrise Period
- Landrush
- General Availability (GA)
- Trademark Claims
- Trademark Clearinghouse (TMCH)
- UDRP
- URS
- Cybersquatting
- Typosquatting
- Brand Protection
- Domain Portfolio
- Domain Investor
- Domain Flipping
- Domain Appraisal
- Secondary Market
- Domain Auction
- Backorder
- Drop-Catching
- Zone File Access
- Thin Registry
- Thick Registry
- DNS Hosting
- Managed DNS
- Nameserver Delegation
- Registrar Accreditation
- ICANN
- IANA
DNS and Records
- DNS
- DNS Resolver
- Recursive Resolver
- Authoritative DNS
- Root Servers
- TLD Servers
- Anycast DNS
- DNS Zone
- Zone File
- SOA Record
- Serial Number (SOA Serial)
- Refresh (SOA)
- Retry (SOA)
- Expire (SOA)
- Minimum TTL
- TTL
- DNS Cache
- DNS Propagation
- Nameserver (NS)
- Glue Records
- Delegation
- Apex / Root (@)
- A Record
- AAAA Record
- CNAME
- ALIAS Record
- ANAME Record
- MX Record
- TXT Record
- SRV Record
- PTR Record
- CAA Record
- NAPTR
- SSHFP
- TLSA (DANE)
- NS Mismatch
- NXDOMAIN
- SERVFAIL
- REFUSED
- DNS Timeout
- Split-Horizon DNS
- Split DNS
- Wildcard DNS
- GeoDNS
- Round-Robin DNS
- DNSSEC
- DS Record
- DNSKEY
- RRSIG
- NSEC
- NSEC3
- KSK
- ZSK
- Key Rollover
- DS Mismatch
- DNS Poisoning
- Cache Poisoning
- DNS DDoS
- DNS Amplification
- EDNS0
- DNS over HTTPS (DoH)
- DNS over TLS (DoT)
- Forwarder
- Stub Resolver
- Resolver Cache Flush
- BIND
- Unbound
- PowerDNS
- Knot DNS
- Reverse DNS (rDNS)
- IP-to-Hostname
- SPF DNS Lookup Limit
- TXT Record Size Limit
- CNAME Flattening
- ACME Challenge (DNS-01)
- _acme-challenge
- _domainkey
- _dmarc
- _mta-sts
- _smtp._tls
Email and Deliverability
- Email Deliverability
- SMTP
- ESMTP
- IMAP
- POP3
- MTA
- MUA
- MDA
- SMTP Relay
- SMTP Authentication
- STARTTLS
- TLS for SMTP
- SMTPS (465)
- Submission (587)
- MX Priority
- Catch-All Mailbox
- Bounce
- Hard Bounce
- Soft Bounce
- NDR (Non-Delivery Report)
- Greylisting
- RBL / DNSBL
- Spamhaus
- Reputation
- Sender Reputation
- IP Reputation
- Domain Reputation
- SPF
- SPF Include
- SPF Redirect
- SPF Softfail (~all)
- SPF Hardfail (-all)
- SPF PermError
- SPF TempError
- SPF Flattening
- DKIM
- DKIM Selector
- DKIM Key Rotation
- DKIM Body Hash
- DKIM Fail
- DMARC
- DMARC Policy
- p=none
- p=quarantine
- p=reject
- pct Tag
- rua
- ruf
- fo Tag
- adkim / aspf
- Alignment
- Identifier Alignment
- DMARC Aggregate Report
- DMARC Forensic Report
- ARC (Authenticated Received Chain)
- ARC Seal
- ARC Fail
- BIMI
- VMC (Verified Mark Certificate)
- MTA-STS
- TLS-RPT
- DANE for SMTP
- SPF/DKIM/DMARC Alignment Fail
- HELO / EHLO
- Reverse DNS Mismatch
- SPF HELO Identity
- MIME
- DKIM Canonicalization
- List-Unsubscribe Header
- Feedback Loop (FBL)
SSL/TLS and Security
- SSL Certificate
- TLS
- HTTPS
- HTTP
- HTTP/2
- HTTP/3 (QUIC)
- URL
- URI
- CSR
- Private Key
- Public Key
- Key Pair
- RSA
- ECDSA
- Certificate Chain
- Intermediate Certificate
- Root Certificate
- Certificate Authority (CA)
- OCSP
- OCSP Stapling
- CRL
- Revocation
- SAN
- Wildcard SSL
- Multi-Domain SSL
- DV SSL
- OV SSL
- EV SSL
- HSTS
- Mixed Content
- TLS Handshake
- Cipher Suite
- Perfect Forward Secrecy (PFS)
- SNI
- ALPN
- Session Resumption
- 0-RTT
- Security Headers
- Content-Security-Policy (CSP)
- X-Frame-Options
- X-Content-Type-Options
- Referrer-Policy
- Permissions-Policy
- SameSite Cookies
- CSRF
- XSS
- SQL Injection
- Clickjacking
- WAF
- DDoS Protection
- Rate Limiting
- Bot Protection
- Malware Scanning
- Phishing
- DNS Hijacking
- MITM
- ACME
- Let’s Encrypt
- Certificate Transparency (CT)
Hosting and Infrastructure
- Shared Hosting
- VPS
- Dedicated Server
- Cloud Hosting
- CDN
- Load Balancing
- Uptime
- Backup
- Snapshot
- Control Panel
- DirectAdmin
- cPanel
- SSH
- SFTP
- FTP
- Nginx
- Apache
- PHP-FPM
- Cron
- MySQL
- PostgreSQL
- Caching
- WAF
- DDoS Protection
SEO and Search Optimization
- SEO
- Search Engine Results Page (SERP)
- Organic Traffic
- Keyword
- Search Query
- Search Intent
- Informational Intent
- Commercial Intent
- Navigational Intent
- Transactional Intent
- Keyword Clustering
- Semantic Core
- Topic Cluster
- Pillar Page
- Entity SEO
- Topical Authority
- E-E-A-T
- CTR (Click-Through Rate)
- Title Tag
- Meta Description
- H1
- H2
- Alt Text
- Internal Linking
- Anchor Text
- Backlink
- Link Equity
- PageRank
- URL Slug
- Friendly URLs
- Canonical URL
- Duplicate Content
- Thin Content
- Snippet
- Featured Snippet
- People Also Ask
- Sitelinks
- Rich Results
- Schema.org
- Structured Data
- FAQPage Schema
- Breadcrumbs Schema
- Organization Schema
- WebSite Schema
- robots.txt
- Meta Robots
- Noindex
- Nofollow
- Indexing
- Deindex
- Crawling
- Crawl Budget
- XML Sitemap
- sitemap.xml
- Image Sitemap
- News Sitemap
- Hreflang
- International SEO
- Geo-Targeting
- Mobile-First Indexing
- Responsive Design
- Core Web Vitals
- LCP
- INP
- CLS
- Page Speed
- TTFB
- Render-Blocking Resources
- Lazy Loading
- Pagination SEO
- Faceted Navigation
- 301 Redirect
- 302 Redirect
- Redirect Chain
- Redirect Loop
- 404
- Soft 404
- 410
- 5xx Errors
- HTTPS Migration
- Site Architecture
- Click Depth
- Breadcrumbs
- JavaScript SEO
- SSR (Server-Side Rendering)
- CSR (Client-Side Rendering)
- Prerendering
- Search Console
- Index Coverage
- Manual Action
- Link Spam
- Disavow
- Branded Traffic
- Non-Branded Traffic
- Conversion Rate (CR)
- SEO A/B Test