Why "use { }" for installing with Lazy?

Right now in the documentation, it says to do this for install with lazy.nvim, why `use { }`?

```lua
use {
  "smjonas/live-command.nvim",
  -- live-command supports semantic versioning via Git tags
  -- tag = "2.*",
  config = function()
    require("live-command").setup()
  end,
}
```