Yes. Google has confirmed that HTTPS is a ranking factor. Sites without HTTPS (running on plain HTTP) are flagged as "Not secure" by Chrome, which scares away visitors and undermines trust. On top of that, many modern APIs and browser features require HTTPS.
Migrating from HTTP to HTTPS involves: obtaining an SSL certificate (free via Let's Encrypt or included with most hosting providers), configuring the server to serve every page over HTTPS, and implementing 301 redirects from all HTTP URLs to HTTPS. You also need to update internal links, sitemaps, and tools such as Google Search Console.
For the vast majority of modern websites, HTTPS is already the standard. If your site still does not use HTTPS, treat it as the top priority, before any other SEO optimization.