PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML.
PayPal is a American international e-commerce service that enables companies and individuals to send money and to accept payments without revealing any financial details.
Website using the € symbol on their website - meaning it may accept payment in Euros.
Content Security Policy is best used as defense-in-depth, to reduce the harm caused by content injection attacks.
UTF-8 (8-bit UCS/Unicode Transformation Format) is a variable-length character encoding for Unicode. It is the preferred encoding for web pages.
Meta descriptions are HTML attributes that provide concise explanations of the contents of web pages. Meta descriptions are commonly used on search engine result pages (SERPs) to display preview snippets for a given page.
The Open Graph protocol enables any web page to become a rich object in a social graph, a open protocol supported by Facebook