You can link additional email addresses to your itch.io account in order to get access to anything purchased under those email addresses. For example, your PayPal email address might be different than your regular email address so you'd want to add it as an additional email.
一个额外的账号安全层,有助于防止外人使用您的密码进行未经授权的访问为账号增设的安全防护层,以防密码泄露时他人侵入您的账号。