Think of this as describing the purpose of the position, and its role within your company or organization as a whole. A job summary will briefly acknowledge the fundamentals of the position, so leave space on your job description template to answer.
Make your job titles specific. Targeted job titles are more effective than generic ones, so be precise by including key phrases that accurately describe the role. Avoid internal lingo that may confuse the job seeker. Stick to standard experience levels like “Senior” rather than “VI” or other terms people are less likely to look for. Keep the job title concise.