ISO/IEC 27001 is an international standard for information security management systems, often shortened to ISMS. It is not a checklist of one-off technical settings. It is a management system for understanding information security risks and improving how those risks are handled over time.
The standard is used by organizations of many sizes and sectors. Its core idea is that information security should be managed deliberately: define scope, understand risks, choose controls, assign responsibilities, keep documented information, measure performance, and improve when something changes.
A common plain-language way to understand the goal is confidentiality, integrity, and availability. Information should be available to the right people, protected from the wrong people, and reliable enough to support decisions.
Certification is separate from using the ideas. Some organizations pursue formal certification through accredited bodies. Others simply borrow the management-system approach to make their internal security practices clearer and more repeatable.
A collaboration platform is not a substitute for an ISMS, but it can support practical pieces of information management: records, task evidence, review dates, process maps, access structure, and admin reports. Those pieces matter because security is easier to evidence when work is organized.
Related: Information Security Basics, Audit Logs, Document Control Basics.