No. Leaving the Schengen Area does not wipe the clock and give you a fresh 90 days. Under the Schengen Borders Code, short stays for most third-country nationals are capped at 90 days in any 180-day period: on each day you are inside the area, authorities look back over the preceding 180 days and check that your total days in Schengen do not exceed 90. The European Commission’s short-stay calculator page explains that you must count back 180 days from each day of stay and keep the total at or below 90.
Days you spend outside Schengen stop adding to the count, but prior days only drop off gradually as they age out of that rolling 180-day window—so a short trip home after using most of your allowance does not restore a full 90. The Commission’s calculator user manual notes one important exception in practice: an uninterrupted absence of 90 days does allow a new stay of up to 90 days again.
Source: European Commission, Migration and Home Affairs — Short-stay calculator (90/180-day rule); see also the Commission’s short-stay calculator user manual.
Image: “Border control at Copenhagen Airport” by hirotomo t, CC BY-SA 2.0, via Wikimedia Commons.