This chapter introduces the field and the scope of research and the fundamental terminology. The basic objective of this monograph is primary onomatopoeia defined as imagic icons of the signified objects; prototypically, they are underived and uninflected monemes. The Introduction maps the state of the art in onomatopoeia research, mainly based on a questionnaire-based survey among language experts covering 124 languages of the world. It accounts for the method of language sampling. Since data collection can be significantly affected by the status of the sample languages, this section also provides their classification according to the Expanded Graded Intergenerational Disruption Scale. This chapter also provides an overview of resources available for research in this field with a focus on the availability of dictionaries and corpora that identify the class of onomatopoeia. Significant attention is given to the categorization of sounds, an aspect often overlooked in onomatopoeia studies. This categorization is crucial for mapping the sound sources and sound events that onomatopoeias represent across the sampled languages.