1) Also called search engine optimization (SEO), website optimization is a phrase that describes the procedures used to optimize – or to design from scratch – a website to rank well in search engines. Website optimization includes processes such as adding relevant keyword and phrases on the website, editing meta tags, image tags, and optimizing other components of your website to ensure that it is accessible to a search engine and improve the overall chances that the website will be indexed by search engines.
2) A phrase used to describe the procedures to optimize the speed at which your website loads in a Web browser. This type of optimization generally involves editing your website to optimize scripts, HTML or CSS code for faster loading. It's also reduces the number of components such as images, scripts, or video components that are needed to render the webpage.
See also HyperText Transfer Protocol (HTTP) the underlying protocol used by the World Wide Web.