Is ACS open access?

Excuse me, I'm conducting some research on scholarly journals and I've come across the acronym "ACS". Could you clarify for me if "ACS" stands for a specific journal or publishing platform? And furthermore, if it does represent a journal, is it an open-access journal? I'm particularly interested in knowing if the content published in "ACS" is freely available to the general public or if there are subscription requirements. This information is crucial for my research, as I'm exploring the accessibility of scholarly materials in the field of cryptocurrency and finance. Thank you for your assistance.