Color fields give you a hexadecimal color input with a preview of the current color, and on browsers that support <input type="color">, clicking on the preview will open the browser’s color picker.

Calling a Color field in your templates will return a api:craft\fields\data\ColorData object, or null if no color was selected.

{% if entry.linkColor %}
    <style type="text/css">
        .content a {
            color: {{ entry.linkColor.getHex() }};
        }
    </style>
{% endif %}