When an article is called a Preprint ? Does uploading an article on RG conflicts with the conditions of publishing it in the journal/conference?
Following etymology, an article is a preprint when it is published before being printed.
Diving into this topic a little bit deeper, and taking into consideration modern forms of publishing papers we could try to be more precise and say that article is a preprint when it is shared electronically from the open platforms not aspiring to take over copyrights, to later let the author publish his paper in a traditional journal (usually having printed form, but not necessarily) but usually taking the copyrights.
The answer to the second question depends on the specific rules of a given journal. Sometimes it is in a conflict and sometimes not.
A pre-print is a complete scientific manuscript that is uploaded by the authors to a public server. The pre-print contains complete data and methodologies; it is often the same manuscript being submitted to a journal for publishing.
I am doubting about such crisp definition presented above.
In my opinion, nothing stops authors from preprinting papers describing their preliminary results. Moreover, there can be many preprints describing research progress at different stages of research related to a given topic.
Moreover, many open platforms support identifying (e.g. by DOI) and even versioning such works (e.g. by DOI versioning). An example of it can be found:
https://blog.zenodo.org/2017/05/30/doi-versioning-launched/
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