Common initialisms are abbreviations formed from the initial letters of a series of words, pronounced letter by letter. Examples include FBI for Federal Bureau of Investigation and NASA for National Aeronautics and Space Administration. These abbreviations are widely used in everyday language, making communication more efficient. Initialisms are often found in various fields, including government, technology, and business. For instance, CEO stands for Chief Executive Officer, while HTML refers to Hypertext Markup Language. Understanding these common initialisms can help individuals navigate conversations and texts more easily.