Slack offers a secure, enterprise-level online setting that allows businesses or anyone to customize their workflow. Slack is secure so that companies and their staff members can securely communicate even confidential information in the system.  There are multiple layers of compliance and certifications that go into making Slack one of the most secure methods of communication and organization for organizations all over the globe. Enterprise Key Management is one of the security features of the platform. Slack is GDPR compliant, can be configured for use in the medical industry to include HIPAA and FINRA compliance. Some of the compliance certifications include SOC 2, SOC 3, and ISO/IEC 27001 to name a few.  Salesforce says you can integrate your existing business security with Slack for further security system notifications and alerts if a threat is detected. In other words, Slack's security is sophisticated.