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Vue allows us to use 'env' variables in our Vue application. Vue can only use variables that start with 'VUE_APP_' and 'Vue_API_KEY' Vue-CLS lets us use these variables when we run our applications. Using your.env variables in your application is super easy to use from your own.env file. The Vue.env. file is typically private, and can be used to store things like API keys, URLs and other things that are specific to one environment.