To facilitate the effective and consistent application of the obligations in this Regulation that may require implementation through technological means, it is important to promote voluntary standards covering certain technical procedures, where the industry can help develop standardised means to support providers of intermediary services in complying with this Regulation, such as allowing the submission of notices, including through application programming interfaces, or standards related to terms and conditions or standards relating to audits, or standards related to the interoperability of advertisement repositories. In addition, such standards could include standards related to online advertising, recommender systems, accessibility and the protection of minors online. Providers of intermediary services are free to adopt the standards, but their adoption does not presume compliance with this Regulation. At the same time, by providing best practices, such standards could in particular be useful for relatively small providers of intermediary services. The standards could distinguish between different types of illegal content or different types of intermediary services, as appropriate.