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Let’s Encrypt is a free and open Certificate Authority that offers SSL/TLS certificates to secure web traffic. In addition to standard domain validation, Let’s Encrypt also supports wildcard domain validation, which allows you to secure all subdomains of a domain with a single certificate. In this tutorial, we’ll walk through the steps of obtaining a wildcard domain DNS TLS certificate from Let’s Encrypt. Step 1: Prerequisites Before we start, make sure you have the following prerequisites installed on your system: