There are a lot of different components involved in SEO. Local SEO generally involves a greater focus on accurate local listings in search engines, analysing the strengths and weakness of local competition and optimising your web presence for best performance against them. National strategies can involve a greater amount of content and specifically targeting different areas of your chosen market. These are broad descriptions and can change depending on the project. If you’re unsure which type of SEO you need, ask yourself if your customers primarily come from your local area or further afield.