What is Palestinian Islamic Jihad and what is its relationship with Hamas?

Israel claimed it has evidence the explosion at al-Ahli Arab hospital in Gaza was caused by the group

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The Islamic Jihad movement in Palestine (Harakat al-Jihad al-Islami fī Filastin), or Palestinian Islamic Jihad (PIJ) as it is more often known, is the second largest armed group in Gaza. It is considered one of the most extreme and uncompromising Palestinian armed factions and operates on the West Bank too. Last week, PIJ were also reported to have attacked Israel from Lebanon. It rejects any political peace process and sees a military victory over Israel as the sole means of attaining its objective of establishing an Islamic state across Israel, the West Bank and Gaza.