Digital marketing agencies plan and deliver online promotion for businesses, organisations and public bodies. Their work may begin with research into a client's audience, competitors and objectives, followed by a marketing strategy and a plan for choosing channels, setting budgets and measuring results. Some agencies provide advice and planning only, while others manage campaigns and produce marketing materials on an ongoing basis. Typical services include search engine optimisation (SEO), paid search and display advertising, social media management and advertising, content creation, email marketing and website design or optimisation. Agencies may also manage online listings, create landing pages, run campaigns across several channels and report on performance using measures such as website visits, enquiries, sales and engagement. The range of services varies: some firms specialise in a particular channel or sector, while others offer a broader service.