How is the frontend header's Sign In link rendered?

Question

I would like to show like this in my theme

Answer 1

Sign in and Create an account link render using Block file.

Sign In label coming from,

vendor/magento/module-customer/Block/Account/AuthorizationLink.php

Create an account coming from,

/vendor/magento/module-customer/view/frontend/layout/default.xml

You can check code,

<block class="Magento\Customer\Block\Account\RegisterLink" name="register-link">
                <arguments>
                    <argument name="label" xsi:type="string" translate="true">Create an Account</argument>
                </arguments>
            </block>