Postgres, benefit of named schema vs public schema?

I am new to Postgres and I am trying to understand how schemas fit into everything and what is the benefit of a non-'public' schema. For example, does it provide security, access control benefits or something else? The setup I am working with is one where postgres owns the database and tables, but grants permissions to another user to select, insert, update, and delete. Would creating the tables in the 'public' schema vs 'myotherschema' make much of a difference?