股票发行方式中的Placing与underwriting分别什么意思?

股票发行方式中的Placing与underwriting分别什么意思?
如题!
Placing
Unquoted companies may find it difficult to raise finance.It is possible to arrange a placing of shares with an institution.It is used for smaller issues of shares.The company’s bank selects institutional investors to buy a number of shares
General public can then buy from the institutions.
Placing是配售发行股票么?还是私募发行?
Underwriting是承销么?