It is a comprehensive word comprising deeds and words that Allah (SWT) loves and is pleased with whether manifested or hidden.
There are two conditions of Ibadah:
1. Sincerity to Allah (SWT).
2. Submission to Allah's Messenger (SAW) (i.e. to act according to his Sunnah).
Some types of Ibadah are the prayers (Salat), the obligatory charity (Zakat), fasting (Saum), the pilgrimage(Hajj), fear (Taqwa) of Allah (SWT), hope in His Mercy, Seeking His aid, and other acts of worship which Allah (SWT) has commanded and enjoined.