Direct answer: Website hosting provides the infrastructure that serves the site, maintenance keeps the site and its information in working condition, and monitoring checks the site for defined conditions such as availability or errors. They are related services, but they are not the same thing.
Hosting: where the website runs
Hosting supplies server resources, storage, networking, and the environment needed to deliver website files or applications to visitors. Hosting quality affects availability and performance, but hosting alone does not mean someone is actively maintaining the website.
Maintenance: keeping the website current
Maintenance can include software updates, content corrections, link and form checks, backups, compatibility work, configuration changes, and other operational tasks. The exact scope should be defined by the service agreement.
Monitoring: watching defined signals
Monitoring repeatedly checks specific conditions and records or alerts on failures. Examples include HTTP availability, response status, certificate conditions, page changes, performance indicators, or selected security-oriented observations.
Security overlaps but remains distinct
Security work may include hardening, access control, patching, vulnerability management, scanning, incident response, and review. Monitoring can detect some security-related signals, but it is not equivalent to a full security program.
Why managed services combine them
A managed website service can coordinate hosting, monitoring, maintenance, and security-oriented review so responsibility is clearer after launch. Buyers should still verify exactly which tasks, response times, and limitations are included.