Tu B'Shevat is the 15th day of the Jewish month of Shevat. It is considered the start of Spring, and the beginning of the new harvest for fruits in the land of Israel. Many have the custom to make a point of eating new season fruits on that day and saying the blessing "shehecheyanu" which expresses thanks for experiencing this special event.

If you are referring to the Jewish New Year (Rosh Hashanah), which fruits are served is a matter of custom. Very many families serve a slice of apple dipped in honey. For allusions to a good year based on the Hebrew words, some also have dates and pomegranates.

On the second night of Rosh Hashanah, it is customary to say the Shehecheyanu blessing on a new fruit (a fruit which one has not eaten yet in the current season).

If you are asking for the definition, it is a type of prayer that blesses God or asks God for blessing.

If you want an example:

בָּרוּךְ אַתָּה יְיָ אֶלוֹהֵינוּ מֶלֶךְ הַעוֹלָם שֵהֵחְיָנוּ וְקִיְמָנוּ וְהִגִיעָנוּ לַזְמַן הַזֶה׃

Baruch atah hashem elokeinu melech ha-olam shehecheyanu vekimanu vehigianu lazman hazeh.

Blessed are you, Eternal our God, ruler of the universe, who has given us life, sustained us, and allowed us to reach this occasion.

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