Vagrant is a tool for building and managing virtual machine environments in a single workflow, created by HashiCorp. To spin up a Vagrant TICK Stack, you need a Vagrantfile, a bootstrap script, and any desired files. The Vagrantfile defines parameters such as memory, mount points, and network settings, while the bootstrap script installs the TICK Stack components, including Telegraf, InfluxDB, Chronograf, and Kapacitor. You can customize the versions of the TICK Stack installed by modifying the version numbers in the bootstrap script. Once the VM is started, you can use it to test and develop your TICK Stack projects using Vagrant's wrapper scripts or simply running `vagrant up`.