How would you define PD?
Any communications strategy, from advertising to propaganda to social media to whatever you want to call it, plays second to reality -- actions really do speak louder than words

As a result, not only friendly or hostile foreign public opinion, but also Turkish public opinion is influenced by the strong negative propaganda efforts from the West and the East that consider everything, including lies, distortion of facts...

This connection between communication and organization pops up in Cold War thinking on writings on ‘public diplomacy’ notably in W. Philips Davison’s (1965) International Political Communication. Davison argues that the key role of communication should be to support the organization of pro-US political forces rather than attacking the communists.

Before public diplomacy, there was propaganda, a term coined by Pope Gregory XV in 1622...A key observation to make regarding the Pope’s call for the propagation of the faith is that the advent of the printing press, the rise in literacy...and the religious controversies...had already created a European sphere of public comment and opinion by the turn of the seventeenth century.

Hasbara is a form of propaganda aimed at an international audience, primarily, but not exclusively, in western countries. It is meant to influence the conversation in a way that positively portrays Israeli political moves and policies, including actions undertaken by Israel in the past.