Is Chef free?
Chef Infra is open source. Commercial products require license. Progress Software owns Chef now.
What is Chef?
Chef is infrastructure automation. Configuration management using Ruby DSL. Alternative to Ansible and Puppet.
Chef vs Ansible?
Chef uses Ruby, Ansible uses YAML. Ansible is agentless, Chef needs agents. Ansible simpler; Chef more powerful for complex setups.
Is Chef still relevant?
Still used in enterprises. Ansible and Terraform more popular now. Chef has strong ecosystem but declining mindshare.