1. Gene editing: simply put--use of molecular tools to edit/change a gene/allele DNA sequence. This can lead to disrupt (knockout) the allele, fix a mutated allele or other applications.
2. Current tools include Zinc finger nucleases (ZFNs), Transcription Activator-Like Effector-based Nucleases (TALEN®), and the CRISPR-Cas system. The most popular one is CRISPR-Cas system due to its easy design.
3. Plenty of review papers about genome editing are online if you type in 'gene editing' or 'genome editing' as key words. Attached is a simple description of the applications of genome editing.
By the way, any technology has its pros and its cons. Some might post risk for the environment or ecosystem. Some can cause ethic problems. We have to make sure to take them into good use.
Genome editing is a novel powerful tools for modifying our genome makeup. However, ethic problem has also raised for using genome editing. Such as the produce of 'designer babies', or as I called it 'cosmetic gene editing' for your babies. See this report: "Year in review: Breakthrough gene editor sparks ethics debate" [ https://www.sciencenews.org/article/year-review-breakthrough-gene-editor-sparks-ethics-debate ].
If you are going to give a seminar, you should include a small section at the end to discuss the 'ethic problem' about this technology. Audience should like to here that.