A secure URL or website often start with “https” rather than “http.” The “s” in “https” stands for secure. So therefore, She should check whether the website start with http or https.
To know secured sites, do use a Secure Sockets Layer (SSL) Certificate to check if the website is secure.
This informs one to know that all your data is encrypted as it passes from your browser to the website's server.
Conclusively, A lot of websites use the data encryption mechanisms TLS (Transport Layer Security) or SSL (Secure Sockets Layer) to protect site and user data as it's passes the website.
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