In a public offering, securities are offered to all interested parties, rather than to a predetermined group of investors. Such placement is accompanied by the publication of information about the issue: parameters, objectives of fund raising, information about the issuer and risks.
Disclosure requirements here are significantly higher than in a private offering, and this is the main investor protection: the decision is made based on officially disclosed data, not private agreements.
For an issuer, public placement means a wider circle of buyers and, as a rule, better conditions for raising funds, but requires greater preparation and publicity.
Practical approach for an investor participating in public placement: study the issue documents rather than promotional materials, determine the price based on your own assessment, and consider the possibility of partial satisfaction of the application in case of high demand. The public nature of the placement provides access to information, but does not confirm the quality of the investment.