What are the Jewish holidays?

Answer 1
A list of Jewish holidays would include:

• Shabbat - every Saturday
• Rosh Chodesh - the new moon, every 29 or 30 days
• Rosh Hashanah - the Jewish New Year, 2 days
• Yom Kippur - fast day, Day of Atonement, 1 day
• Sukkot - Tabernacles - 7 or 8 days
• Shemini Atzeret and Simchat Torah - 1 or 2 days
• Hanukkah - 8 days
• Tu Bishvat - 1 day
• Purim - 1 day
• Pesach - Passover - 7 or 8 days
• Pesach Sheni - 1 day
• Lag Ba'omer - 1 day
• Shavuot - Pentecost - 2 days
• Tu B'Av - 1 day

Jewish holidays begin at sunset and last until after nightfall 25 hours later.
There are also some fast days (besides for Yom Kippur) observed:

• Tzom Gedalya; the morrow of Rosh Hashana
• Asara B'Tevet - 10th of the month of Tevet, a week after Hanukkah
• Ta'anit Esther - the day before Purim
• Shiva Asar B'Tamuz - 17 of Tamuz
• ** The 3 weeks between these 2 fasts are a period of mourning referred to as "the 3 weeks" or Bein Hametzarim
• Tisha B'Av - 9th of the month of Av
• All other minor fasts start at dawn and end at nightfall. Tisha B'Av starts the evening before at sunset and lasts for 25 hours.

There are also some "new" festivals instituted since the State of Israel was founded. Not all orthodox Jews celebrate these days:

• Yom HaShoah - a day commemorating the holocaust
• Yom HaAtzmaut - Israel's Independence day

A good place to start is the Answers.com Jewish Holiday Link which has links to all the festivals and relevant pictures.


Answer 2
Here is a list of Jewish holidays:

1 Rosh Hashanah - The Jewish New Year
2 Aseret Yemei Teshuva - Ten Days of Repentance
3 Yom Kippur - Day of Atonement
4 Sukkot - Feast of Booths (or Tabernacles)
5 Shemini Atzeret
5b Simchat Torah
6 Hanukkah - Festival of Lights
7 Tenth of Tevet
8 Tu Bishvat - New Year of the Trees
9 Purim - Festival of Lots
10 New Year for Kings (extinct)
11 Pesach - Passover
12 Sfirat ha'omer - Counting of the Omer
13 Lag Ba'omer
14 Shavuot - Feast of Weeks - Yom HaBikurim
15 Seventeenth of Tammuz
16 The Three Weeks and the Nine Days
17 Tisha B'av - Ninth of Av
18 Tithe of animals (extinct)
19 Rosh Chodesh - the New Month
20 Shabbat - The Sabbath
21 Yom HaShoah - Holocaust Remembrance day
22 Yom Hazikaron - Memorial Day
23 Yom Ha'atzmaut - Israel Independence Day
24 Yom Yerushalaim - Jerusalem Day
25 Fast of Gedalia
26 Ta'anit Esther
27 Fast of the First Born

Plus others that are regional or ethnic

Answer 3
The holidays are days in which work is not done, and there are additional prayers and festive meals. These are Pesach, Shavuot, Sukkot and Rosh Hashanah.
Another holy day, Yom Kippur, is for prayer and fasting.
-- Shabbat . . . every Saturday

-- Rosh Chodesh . . . every New Moon

-- Passover . . . early Spring

-- Savuot . . . late Spring

-- Rosh Hashana
-- Yom Kippur
-- Sukkot . . . . . . . . early-to-mid Autumn

The above are all of the holidays set out in the Torah.

Others have been added in post-Torah centuries, and will no doubt be
added to this answer by other contributors.

See the attached Related Links.