What file formats can be restored using pg_restore on PostgreSQL? first question here, fairly new to DB's and Data itself.

My question is fairly simple, after playing around with Postgres, PGAdmin3, I realised I would like to access some public data, but I struggled to find any publicly available .tar files to practice with. Leading me to wonder what file formats you can restore from.

What file formats can I restore from using pg_restore? And is there a preference in the community towards certain formats?

Thanks for your time. Look forward to participating on the forum. 

PS: If it wasn't clear, I am restoring from command line.
Exactly one file format is supported by pg_restore: the custom PostgreSQL dump formats from pg_dump -F c (custom), -F d (directory) and -F t (tar). Notably it cannot restore -F s (SQL) format dumps, which must be passed to psql -f instead.

If you want to load data, you probably want the \copy command from psql or the server-backend COPY command. It can load a variety of CSV-like data.

There are also external loader and ETL tools that can do more, e.g. pgloader, Talend Studio, Pentaho Kettle, CloverETL, etc.