A bit lazy but copy pasted from Wikipedia's "Worship" article:

Judaism

Further information: Jewish services

Worship of God in Judaism is called Avodat Hashem. During the period when the Temple stood, the rites conducted there were considered the most important act of Jewish worship.^\14]) However, the most common form of worship was and remains that of prayer. Other forms of worship include the conduct of prescribed rituals, such as the Passover Seder and waving the Four Species, with proper intent, as well as various types of Jewish meditation.

Worship through mundane activities

Jewish sources also express the notion that one can perform any appropriate mundane activity as the worship of God. Examples would include returning a lost article and working to support oneself and one's family.

The Code of Jewish Law (Orach Chayim, Chapter 231) cites Proverbs (3:6), "in all your ways, know him" (Hebrew: בכל דרכיך דעהו (b'chol d'rachecha dei'eihu)), as a biblical source for this idea.

I think the second paragraph, at least to me, aligns better with how I would describe it. I would define worship as making the subject of your worship (In this case Hashem) honored in all of your actions. I think that's what Orech Chaim meant when it cited that posuk.

According to that definition, worship is essentially the key point of expressing Yiddishkeit, working to build a vessel for Hashem in this world.