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Difference between spontaneous and non-spontaneous processes?

Spontaneous processes are those processes which can take place on their own under given set of conditions. Non-spontaneous reactions are those which do not occur on their own under the given set of conditions. 

In thermodynamic, for spontaneous processes, the change in Gibb's free energy is negative. That is for spontaneous processes

   ΔG0 < 0 

For non-spontaneous processes, the change in Gibb's free energy is positive. That is for non-spontaneous processes

   ΔG0 > 0 

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HELLO SIR Your answer for the query is

Spontaneous reactions will take place automatically under the right conditions (diferent reactions are spontaneous at different temperatures). If you put them together, it will happen by itself.

Nonspontaneous reactions require an input of energy to take place.

The "delta" probably refers to Gibbs Free Energy change, which must be less than zero for a spontaneous reaction to work.

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