Ongoing customer communication in e-marketing involves using online marketing communication (OMC) methods to both strengthen brands and promote sales. OMC has two main purposes - to inform consumers about product features to build the brand, and directly encourage purchases. Common OMC methods include online advertising, direct email marketing, online catalogs, and public relations. Online advertising takes various forms like banners, paid search placements, sponsorships, and affiliate relationships. Effective communication blends both online and offline tactics to maximize results.